1. The correct form is 'I have ____ my homework already,' not 'I have do my homework.'
2. When proofreading your report, look out for subject–verb agreement and ____ any mistakes you find.
3. In your revision, make sure you ____ any inconsistencies in tense before submitting the final draft.
4. We are ready to fix the grammar in this sentence.
5. The teacher checks our essays for grammar mistakes every Friday.
6. He can fix the grammar error with a simple rule.