Study

change of tense

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9. May

Might

4. Present perfect continuous

Past perfect continuous

10. Must

Had to *(nếu chỉ sự bắt buộc)*

8. Can

Could

3. Present perfect

Past perfect

5. Past simple

Past perfect

7. Future simple (will + V)

Would + V

12. Have to

Had to

6. Past continuous

Past perfect continuous

1. Present simple

Past simple

13. Is/are going to

Was/were going to

2. Present continuous

Past continuous