Choose the appropriate modal verb
1) I (must / have to) study harder because I want to pass the exam.
2) Alex (must / had to) leave the party early yesterday. His parents didn't let him stay until late.
3) Anne can't come to the park with us. She (must / has to) help her mum with the housework.
4) Your grandparents are waiting for you. You (must / have to) come and visit them.
5) If you are fined, you (mustn't / don’t have to) pay the fine immediately. You have a few weeks time.
6) You (mustn't / don't have to) make any noise before nine in the morning or grandma will get really angry.
Complete with MUST or HAVE TO in the correct tense
7) You wear gloves to clean the bathroom, but it's advisable.
8) I hate my new job. I usually work at weekends.
9) This room is a mess, I find time to clean it!
10) There was nobody to help me. I do everything by myself.
11) I'm not working next week, so I get up early.
12) You use your mobile phone while driving.

1) I have to study harder because I want to pass the exam.
Explanation: "Have to" is used to express an obligation or necessity. In this case, the speaker feels obligated to study harder in order to pass the exam.

2) Alex had to leave the party early yesterday. His parents didn't let him stay until late.
Explanation: "Had to" is used to express a past obligation or necessity. In this case, Alex was obligated to leave the party early because his parents didn't allow him to stay late.

3) Anne can't come to the park with us. She has to help her mum with the housework.
Explanation: "Has to" is used to express a present obligation or necessity. In this case, Anne is obligated to help her mum with the housework, therefore she can't come to the park.

4) Your grandparents are waiting for you. You have to come and visit them.
Explanation: "Have to" is used to express a present obligation or necessity. In this case, the speaker is obligated to come and visit their grandparents because they are waiting for them.

5) If you are fined, you don’t have to pay the fine immediately. You have a few weeks' time.
Explanation: "Don't have to" is used to express the absence of obligation. In this case, if the person is fined, they are not obligated to pay the fine immediately, they have a few weeks' time to do so.

6) You mustn't make any noise before nine in the morning or grandma will get really angry.
Explanation: "Mustn't" is used to express prohibition or a strong prohibition. In this case, making noise before nine in the morning is strongly prohibited in order to avoid angering grandma.

7) You must wear gloves to clean the bathroom, but it's advisable.
Explanation: "Must" is used to express an obligation or strong recommendation. In this case, it is necessary to wear gloves while cleaning the bathroom for hygiene and safety purposes. It is also advisable to do so.

8) I hate my new job. I usually have to work at weekends.
Explanation: "Have to" is used to express an obligation or necessity. In this case, the speaker feels obligated to work at weekends as part of their job even though they hate it.

9) This room is a mess. I must find time to clean it!
Explanation: "Must" is used to express an obligation or necessity. In this case, the speaker feels obligated to find time to clean the room because it is a mess.

10) There was nobody to help me. I had to do everything by myself.
Explanation: "Had to" is used to express a past obligation or necessity. In this case, the speaker was obligated to do everything by themselves because there was nobody to help them.

11) I'm not working next week, so I don't have to get up early.
Explanation: "Don't have to" is used to express the absence of obligation. In this case, since the speaker is not working next week, they are not obligated to get up early.

12) You mustn't use your mobile phone while driving.
Explanation: "Mustn't" is used to express prohibition or a strong prohibition. In this case, using a mobile phone while driving is strongly prohibited for safety reasons.