Choose the right modal verb. (Let´s revise: must, have to, may, might, can, could, should – affirmative or negative)
1- they (can / might) be away for the weekend but I´m not sure.
2- You (may / might) leave now if you wish.
3- (Could / May) you open the window please?
4- He ( can / could ) be French judging by his accent.
5- (May / can ) you play the piano?
6- Listen please, you ( may not / might not ) speak during this exam.
7- With luck, tomorrow ( can / could ) be a sunny day.
8- You ( can / might ) be right but I´m going back to check anyway.
9- This ( can / could ) be the right answer but we´ll have to check with your teacher to make sure.
10- They ( may / can ) be away for the weekend but I´m not sure.
11- The exam ( can / might ) be easy, you never know.
12- I ( might / can ) go to the party, but I´m not sure yet.
13- She´s been revising ten hours a day for three weeks, she ( must / can ) be exhausted.
14- They ( may not / can´t ) still be out!
15- Mary ! you (mustn´t / doesn´t have to ) say rude words like that.
16- You ( don´t have to / mustn´t ) finish the exercise now, you can finish it at home.
17- It´s OK , you ( don´t have to / mustn´t ) pay now, you can pay me at the end of the month.
18- Tom! You ( mustn´t / don´t have to ) pick your nose in class, it´s really disgusting.
19- You ( must / have to ) phone granny, it´s her birthday tomorrow.
20- You ( mustn´t / don´t have to ) stay out so late without ringing me, I was worried.
21- If you go sailing, you ( must / should / might ) wear a jacket, the sea is very dangerous.
22- Slow down or we´re going to have an accident, you ( shouldn´t / can´t ) drive so fast.
23- Tomorrow´s a holiday, we ( don´t have to / mustn´t / shouldn´t ) to get up early.
24- You should take an umbrella, it ( has to / must / might ) rain.
25- Where is the toilet? I ( might / should / mustn´t / have to ) go.
26- It´s not obligatory to take a tie, you ( mustn´t / shouldn´t / don´t have to ) wear one.
27- You (must / should / might) do your homework on Saturday morning, thay way you have the rest of the weekend free.
28- You ( mustn´t / shouldn´t ) be horrible to your sister, it makes her very sad.
29- Yesterday I ( must / have to / had to) finish my project.
30- In China many children ( must / have to) wear uniforms when they go to school.
31- I ( have to / must ) go now because I´m already late for my class.
32- Father to his son : “You ( have to / must ) obey your mother.
33- You ( have to / must ) see the boss.
34- It´s a wonderful party but we ( must / have to ) go because of the babysitter.
35- I ( have to / must) see the dentist tomorrow, I have an appointment.
36- I ( must / have to) make an appointment with the dentist because I´ve got toothache.

KEY
1- might
2-may
3-could
4-could
5-can
6-may not
7-could
8-might
9-could
10-may
11-might
12- might
13- must
14-can´t
15- mustn´t
16-don´t have to
17-don´t have to
18-mustn´t
19-mustn´t
20- mustn´t
21-must
22- shouldn´t
23-don´t have to
24- might
25-have to
26- don´t have to
27-should
28-mustn´t
29- had to
30- have to
31-have to
32- must
33-have to
34-have to
35-have to
36- must

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