diff --git a/compiler/dex/quick/dex_file_method_inliner.cc b/compiler/dex/quick/dex_file_method_inliner.cc
index 32d7518..4617668 100644
--- a/compiler/dex/quick/dex_file_method_inliner.cc
+++ b/compiler/dex/quick/dex_file_method_inliner.cc
@@ -110,9 +110,9 @@
 static_assert(kIntrinsicIsStatic[kIntrinsicAbsFloat], "AbsFloat must be static");
 static_assert(kIntrinsicIsStatic[kIntrinsicAbsDouble], "AbsDouble must be static");
 static_assert(kIntrinsicIsStatic[kIntrinsicMinMaxInt], "MinMaxInt must be static");
-static_assert(kIntrinsicIsStatic[kIntrinsicMinMaxLong], "MinMaxLong_must_be_static");
-static_assert(kIntrinsicIsStatic[kIntrinsicMinMaxFloat], "MinMaxFloat_must_be_static");
-static_assert(kIntrinsicIsStatic[kIntrinsicMinMaxDouble], "MinMaxDouble_must_be_static");
+static_assert(kIntrinsicIsStatic[kIntrinsicMinMaxLong], "MinMaxLong must be static");
+static_assert(kIntrinsicIsStatic[kIntrinsicMinMaxFloat], "MinMaxFloat must be static");
+static_assert(kIntrinsicIsStatic[kIntrinsicMinMaxDouble], "MinMaxDouble must be static");
 static_assert(kIntrinsicIsStatic[kIntrinsicCos], "Cos must be static");
 static_assert(kIntrinsicIsStatic[kIntrinsicSin], "Sin must be static");
 static_assert(kIntrinsicIsStatic[kIntrinsicAcos], "Acos must be static");
@@ -153,7 +153,7 @@
 static_assert(kIntrinsicIsStatic[kIntrinsicPeek], "Peek must be static");
 static_assert(kIntrinsicIsStatic[kIntrinsicPoke], "Poke must be static");
 static_assert(!kIntrinsicIsStatic[kIntrinsicCas], "Cas must not be static");
-static_assert(!kIntrinsicIsStatic[kIntrinsicUnsafeGet], "UnsafeGet_must_not_be_static");
+static_assert(!kIntrinsicIsStatic[kIntrinsicUnsafeGet], "UnsafeGet must not be static");
 static_assert(!kIntrinsicIsStatic[kIntrinsicUnsafePut], "UnsafePut must not be static");
 static_assert(kIntrinsicIsStatic[kIntrinsicSystemArrayCopyCharArray],
               "SystemArrayCopyCharArray must be static");
diff --git a/compiler/dwarf/register.h b/compiler/dwarf/register.h
index b67e8dd..35b3e15 100644
--- a/compiler/dwarf/register.h
+++ b/compiler/dwarf/register.h
@@ -29,7 +29,7 @@
   // TODO: Arm S0–S31 register mapping is obsolescent.
   //   We should use VFP-v3/Neon D0-D31 mapping instead.
   //   However, D0 is aliased to pair of S0 and S1, so using that
-  //   mapping we can not easily say S0 is spilled and S1 is not.
+  //   mapping we cannot easily say S0 is spilled and S1 is not.
   //   There are ways around this in DWARF but they are complex.
   //   It would be much simpler to always spill whole D registers.
   //   Arm64 mapping is correct since we already do this there.
diff --git a/compiler/elf_writer_debug.cc b/compiler/elf_writer_debug.cc
index 3e64762..e03614f 100644
--- a/compiler/elf_writer_debug.cc
+++ b/compiler/elf_writer_debug.cc
@@ -212,7 +212,7 @@
     case kNone:
       break;
   }
-  LOG(FATAL) << "Can not write CIE frame for ISA " << isa;
+  LOG(FATAL) << "Cannot write CIE frame for ISA " << isa;
   UNREACHABLE();
 }
 
diff --git a/compiler/optimizing/parallel_move_resolver.cc b/compiler/optimizing/parallel_move_resolver.cc
index 9d136f3..be470cc 100644
--- a/compiler/optimizing/parallel_move_resolver.cc
+++ b/compiler/optimizing/parallel_move_resolver.cc
@@ -504,7 +504,7 @@
 void ParallelMoveResolverNoSwap::UpdateMoveSource(Location from, Location to) {
   // This function is used to reduce the dependencies in the graph after
   // (from -> to) has been performed. Since we ensure there is no move with the same
-  // destination, (to -> X) can not be blocked while (from -> X) might still be
+  // destination, (to -> X) cannot be blocked while (from -> X) might still be
   // blocked. Consider for example the moves (0 -> 1) (1 -> 2) (1 -> 3). After
   // (1 -> 2) has been performed, the moves left are (0 -> 1) and (1 -> 3). There is
   // a dependency between the two. If we update the source location from 1 to 2, we
diff --git a/runtime/common_runtime_test.cc b/runtime/common_runtime_test.cc
index e89c5af..3df9101 100644
--- a/runtime/common_runtime_test.cc
+++ b/runtime/common_runtime_test.cc
@@ -232,7 +232,7 @@
   }
 
   if (founddir.empty()) {
-    ADD_FAILURE() << "Can not find Android tools directory.";
+    ADD_FAILURE() << "Cannot find Android tools directory.";
   }
   return founddir;
 }
diff --git a/runtime/dex_file.h b/runtime/dex_file.h
index 8a3db6c..108b8d2 100644
--- a/runtime/dex_file.h
+++ b/runtime/dex_file.h
@@ -1094,11 +1094,11 @@
   int32_t GetLineNumFromPC(ArtMethod* method, uint32_t rel_pc) const
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  // Returns false if there is no debugging information or if it can not be decoded.
+  // Returns false if there is no debugging information or if it cannot be decoded.
   bool DecodeDebugLocalInfo(const CodeItem* code_item, bool is_static, uint32_t method_idx,
                             DexDebugNewLocalCb local_cb, void* context) const;
 
-  // Returns false if there is no debugging information or if it can not be decoded.
+  // Returns false if there is no debugging information or if it cannot be decoded.
   bool DecodeDebugPositionInfo(const CodeItem* code_item, DexDebugNewPositionCb position_cb,
                                void* context) const;
 
diff --git a/runtime/entrypoints/entrypoint_utils-inl.h b/runtime/entrypoints/entrypoint_utils-inl.h
index 68f2dcb..0663b7e 100644
--- a/runtime/entrypoints/entrypoint_utils-inl.h
+++ b/runtime/entrypoints/entrypoint_utils-inl.h
@@ -193,10 +193,10 @@
       return nullptr;
     }
     gc::Heap* heap = Runtime::Current()->GetHeap();
-    // Pass in false since the object can not be finalizable.
+    // Pass in false since the object cannot be finalizable.
     return klass->Alloc<kInstrumented, false>(self, heap->GetCurrentAllocator());
   }
-  // Pass in false since the object can not be finalizable.
+  // Pass in false since the object cannot be finalizable.
   return klass->Alloc<kInstrumented, false>(self, allocator_type);
 }
 
@@ -207,7 +207,7 @@
                                                       Thread* self,
                                                       gc::AllocatorType allocator_type) {
   DCHECK(klass != nullptr);
-  // Pass in false since the object can not be finalizable.
+  // Pass in false since the object cannot be finalizable.
   return klass->Alloc<kInstrumented, false>(self, allocator_type);
 }
 
diff --git a/runtime/gc/collector/mark_compact.cc b/runtime/gc/collector/mark_compact.cc
index ce6467a..7727b2d 100644
--- a/runtime/gc/collector/mark_compact.cc
+++ b/runtime/gc/collector/mark_compact.cc
@@ -180,7 +180,7 @@
   t.NewTiming("ProcessCards");
   // Process dirty cards and add dirty cards to mod-union tables.
   heap_->ProcessCards(GetTimings(), false, false, true);
-  // Clear the whole card table since we can not Get any additional dirty cards during the
+  // Clear the whole card table since we cannot get any additional dirty cards during the
   // paused GC. This saves memory but only works for pause the world collectors.
   t.NewTiming("ClearCardTable");
   heap_->GetCardTable()->ClearCardTable();
diff --git a/runtime/gc/collector/semi_space.cc b/runtime/gc/collector/semi_space.cc
index 99e98bb..2784693 100644
--- a/runtime/gc/collector/semi_space.cc
+++ b/runtime/gc/collector/semi_space.cc
@@ -227,7 +227,7 @@
   BindBitmaps();
   // Process dirty cards and add dirty cards to mod-union tables.
   heap_->ProcessCards(GetTimings(), kUseRememberedSet && generational_, false, true);
-  // Clear the whole card table since we can not Get any additional dirty cards during the
+  // Clear the whole card table since we cannot get any additional dirty cards during the
   // paused GC. This saves memory but only works for pause the world collectors.
   t.NewTiming("ClearCardTable");
   heap_->GetCardTable()->ClearCardTable();
diff --git a/runtime/gc/collector_type.h b/runtime/gc/collector_type.h
index 416510d..c8e913c 100644
--- a/runtime/gc/collector_type.h
+++ b/runtime/gc/collector_type.h
@@ -34,7 +34,7 @@
   kCollectorTypeSS,
   // A generational variant of kCollectorTypeSS.
   kCollectorTypeGSS,
-  // Mark compact colector.
+  // Mark compact collector.
   kCollectorTypeMC,
   // Heap trimming collector, doesn't do any actual collecting.
   kCollectorTypeHeapTrim,
diff --git a/runtime/gc/reference_processor.cc b/runtime/gc/reference_processor.cc
index 39ba743..5e7f1a2 100644
--- a/runtime/gc/reference_processor.cc
+++ b/runtime/gc/reference_processor.cc
@@ -86,7 +86,7 @@
     // it to the mutator as long as the GC is not preserving references.
     if (LIKELY(collector_ != nullptr)) {
       // If it's null it means not marked, but it could become marked if the referent is reachable
-      // by finalizer referents. So we can not return in this case and must block. Otherwise, we
+      // by finalizer referents. So we cannot return in this case and must block. Otherwise, we
       // can return it to the mutator as long as the GC is not preserving references, in which
       // case only black nodes can be safely returned. If the GC is preserving references, the
       // mutator could take a white field from a grey or white node and move it somewhere else
diff --git a/runtime/gc/space/large_object_space.cc b/runtime/gc/space/large_object_space.cc
index 2798b21..e70fe21 100644
--- a/runtime/gc/space/large_object_space.cc
+++ b/runtime/gc/space/large_object_space.cc
@@ -521,7 +521,7 @@
   num_bytes_allocated_ += allocation_size;
   total_bytes_allocated_ += allocation_size;
   mirror::Object* obj = reinterpret_cast<mirror::Object*>(GetAddressForAllocationInfo(new_info));
-  // We always put our object at the start of the free block, there can not be another free block
+  // We always put our object at the start of the free block, there cannot be another free block
   // before it.
   if (kIsDebugBuild) {
     mprotect(obj, allocation_size, PROT_READ | PROT_WRITE);
diff --git a/runtime/instrumentation.cc b/runtime/instrumentation.cc
index 7d60264..7d55e8c 100644
--- a/runtime/instrumentation.cc
+++ b/runtime/instrumentation.cc
@@ -931,7 +931,7 @@
                                                    ArtMethod* caller,
                                                    uint32_t dex_pc,
                                                    ArtMethod* callee) const {
-  // We can not have thread suspension since that would cause the this_object parameter to
+  // We cannot have thread suspension since that would cause the this_object parameter to
   // potentially become a dangling pointer. An alternative could be to put it in a handle instead.
   ScopedAssertNoThreadSuspension ants(thread, __FUNCTION__);
   for (InstrumentationListener* listener : invoke_virtual_or_interface_listeners_) {
diff --git a/runtime/intern_table.h b/runtime/intern_table.h
index 8f715a3..2b2176e 100644
--- a/runtime/intern_table.h
+++ b/runtime/intern_table.h
@@ -61,7 +61,7 @@
       SHARED_REQUIRES(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
 
   // Only used by image writer. Special version that may not cause thread suspension since the GC
-  // can not be running while we are doing image writing. Maybe be called while while holding a
+  // cannot be running while we are doing image writing. Maybe be called while while holding a
   // lock since there will not be thread suspension.
   mirror::String* InternStrongImageString(mirror::String* s)
       SHARED_REQUIRES(Locks::mutator_lock_);
diff --git a/runtime/oat_file.cc b/runtime/oat_file.cc
index 83e594b..d2f563b 100644
--- a/runtime/oat_file.cc
+++ b/runtime/oat_file.cc
@@ -627,7 +627,7 @@
 
   if (dl_iterate_phdr(dl_iterate_context::callback, &context) == 0) {
     PrintFileToLog("/proc/self/maps", LogSeverity::WARNING);
-    LOG(ERROR) << "File " << elf_filename << " loaded with dlopen but can not find its mmaps.";
+    LOG(ERROR) << "File " << elf_filename << " loaded with dlopen but cannot find its mmaps.";
   }
 #endif
 }
diff --git a/runtime/prebuilt_tools_test.cc b/runtime/prebuilt_tools_test.cc
index a7f7bcd..eb226d4 100644
--- a/runtime/prebuilt_tools_test.cc
+++ b/runtime/prebuilt_tools_test.cc
@@ -34,7 +34,7 @@
     struct stat exec_st;
     std::string exec_path = tools_dir + tool;
     if (stat(exec_path.c_str(), &exec_st) != 0) {
-      ADD_FAILURE() << "Can not find " << tool << " in " << tools_dir;
+      ADD_FAILURE() << "Cannot find " << tool << " in " << tools_dir;
     }
   }
 }
@@ -42,7 +42,7 @@
 TEST_F(PrebuiltToolsTest, CheckHostTools) {
   std::string tools_dir = GetAndroidHostToolsDir();
   if (tools_dir.empty()) {
-    ADD_FAILURE() << "Can not find Android tools directory for host";
+    ADD_FAILURE() << "Cannot find Android tools directory for host";
   } else {
     CheckToolsExist(tools_dir);
   }
@@ -54,7 +54,7 @@
   for (InstructionSet isa : isas) {
     std::string tools_dir = GetAndroidTargetToolsDir(isa);
     if (tools_dir.empty()) {
-      ADD_FAILURE() << "Can not find Android tools directory for " << isa;
+      ADD_FAILURE() << "Cannot find Android tools directory for " << isa;
     } else {
       CheckToolsExist(tools_dir);
     }
diff --git a/runtime/utf_test.cc b/runtime/utf_test.cc
index 5239e40..c67879b 100644
--- a/runtime/utf_test.cc
+++ b/runtime/utf_test.cc
@@ -353,7 +353,7 @@
     if (codePoint <= 0xffff) {
       if (codePoint >= 0xd800 && codePoint <= 0xdfff) {
         // According to the Unicode standard, no character will ever
-        // be assigned to these code points, and they can not be encoded
+        // be assigned to these code points, and they cannot be encoded
         // into either utf-16 or utf-8.
         continue;
       }
diff --git a/test/137-cfi/cfi.cc b/test/137-cfi/cfi.cc
index 9bfe429..77301d2 100644
--- a/test/137-cfi/cfi.cc
+++ b/test/137-cfi/cfi.cc
@@ -76,7 +76,7 @@
     }
   }
 
-  printf("Can not find %s in backtrace:\n", seq[cur_search_index].c_str());
+  printf("Cannot find %s in backtrace:\n", seq[cur_search_index].c_str());
   for (Backtrace::const_iterator it = bt->begin(); it != bt->end(); ++it) {
     if (BacktraceMap::IsValid(it->map)) {
       printf("  %s\n", it->func_name.c_str());
@@ -112,7 +112,7 @@
 
   std::unique_ptr<Backtrace> bt(Backtrace::Create(BACKTRACE_CURRENT_PROCESS, GetTid()));
   if (!bt->Unwind(0, nullptr)) {
-    printf("Can not unwind in process.\n");
+    printf("Cannot unwind in process.\n");
     return JNI_FALSE;
   } else if (bt->NumFrames() == 0) {
     printf("No frames for unwind in process.\n");
@@ -205,7 +205,7 @@
   std::unique_ptr<Backtrace> bt(Backtrace::Create(pid, BACKTRACE_CURRENT_THREAD));
   bool result = true;
   if (!bt->Unwind(0, nullptr)) {
-    printf("Can not unwind other process.\n");
+    printf("Cannot unwind other process.\n");
     result = false;
   } else if (bt->NumFrames() == 0) {
     printf("No frames for unwind of other process.\n");
diff --git a/test/141-class-unload/src/Main.java b/test/141-class-unload/src/Main.java
index 0640b36..bcb697a 100644
--- a/test/141-class-unload/src/Main.java
+++ b/test/141-class-unload/src/Main.java
@@ -79,7 +79,7 @@
 
     private static void testUnloadClass(Constructor constructor) throws Exception {
         WeakReference<Class> klass = setUpUnloadClass(constructor);
-        // No strong refernces to class loader, should get unloaded.
+        // No strong references to class loader, should get unloaded.
         Runtime.getRuntime().gc();
         WeakReference<Class> klass2 = setUpUnloadClass(constructor);
         Runtime.getRuntime().gc();
@@ -91,7 +91,7 @@
     private static void testUnloadLoader(Constructor constructor)
         throws Exception {
       WeakReference<ClassLoader> loader = setUpUnloadLoader(constructor, true);
-      // No strong refernces to class loader, should get unloaded.
+      // No strong references to class loader, should get unloaded.
       Runtime.getRuntime().gc();
       // If the weak reference is cleared, then it was unloaded.
       System.out.println(loader.get());
@@ -109,7 +109,7 @@
 
     private static void testLoadAndUnloadLibrary(Constructor constructor) throws Exception {
         WeakReference<ClassLoader> loader = setUpLoadLibrary(constructor);
-        // No strong refernces to class loader, should get unloaded.
+        // No strong references to class loader, should get unloaded.
         Runtime.getRuntime().gc();
         // If the weak reference is cleared, then it was unloaded.
         System.out.println(loader.get());