1)Yesterday I (must/ mustn;t/ had to) finish my English project.

2. He will (must/ have to/ has to) wait in line like everyone else.

3. We (must be/ mustn't / have to) on time for work.

4. We (have to not/ must/ mustn't) forget to take the chicken out of the freezer.

5. If you are under 15, you (have/ must/ mustn't) to get yourparents permission. 

6. Your child may (have to/ had to/ must) try on a few different sizes.

7. The doctor (must/ mustn't/ have to) get here as soon as he can.

8. Do you (have to/ must/ mustn't) work next weekend?

9. Bicyclists (mustn't/ must/ has to) remember to signal when they turn.

10. Susan, you (mustn't/ must/ have to) leave your clothes all over the floor like this.

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học tốt!

:)

1) had to ( quá khứ đơn : yesterday)

2) have to ( will + V)

3) must be ( Chúng ta phải đúng giờ trong công việc)

4) mustn't ( Chúng ta không được quên lấy gà ra khỏi tủ đông.)

5) have ( have + to V : phải làm gì)

6) have to ( have + to V : phải làm gì)

7) must ( must + V : phải làm gì)

8) have to ( have + to V : phải làm gì)

9) must  ( must + V : phải làm gì)

10) mustn't ( Susan, cô không được để quần áo của mình vương vãi khắp sàn như thế này.)