Auxiliaries here are used both alone and as part of various tenses of ordinary verbs.
Here are some exercises on Auxiliary verbs
Read the following (a) in the negative (b) in the interrogative. These sentences, except for nos. I and 13, could also be used for question tag exercises.
1 may for possibility rarely begins a sentence. Instead we use do you think (that) + present/future or is + subject + likely + infinitive:
Tom may know.
Do you think (that) Tom knows?
Is Tom likely to know?
2 Use needn’t as the negative of must.
1 It may cost Ј100.
2 Men should help with the housework.
3 Tom would pay her.
4 They could play the guitar.
5 We’re seeing Mary tomorrow.
6 She ought to keep it in the f ridge.
7 You can understand it.
8 The police were watching the house.
9 You can go with him. 10 They’ve got a house.
11 Your boss will be angry.
12 Tom should pay the fine.
13 They may come tonight.
14 They were cleaning their shoes.
15 He must write in French.
16 You have read the instructions.
17 These pearls are made by oysters.
18 The ice was thick enough to walk on.
19 This will take a long time.
20 They may (permission) take the car.
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21 You’ve made a mistake.
22 Ann would like a skiing holiday.
23 We must do it at once.
24 Tom could come.
25 They were in a hurry.
26 There is enough salt in it.
27 You could see the sea from the house.
28 Ann will be able to drive you.
29 They had written to him.
30 We must cook it in butter.
31 It is freezing.
32 She ought to accept the offer.
33 There’11 be time for tea.
34 I’m right.
35 He may be at home.
36 He used to live here.