Fill each of the following gaps with a suitable auxiliary or auxiliary form

Use must not or need not to fill the spaces in the following sentences.

1 You . . . ring the bell; I have a key.

2 Notice in cinema: Exit doors . . . be locked during performances.
3 You . . . drink this: it is poison.
4 We . . . drive fast; we have plenty of time.
5 You . . . drive fast; there is a speed limit here.
6 Candidates . . . bring books into the examination room.
7 You . . . write to him for he will be here tomorrow.
8 We . . . make any noise or we'll wake the baby.
11 We . . . reheat the pie. We can eat it cold.
12 Mother to child: You . . . tell lies.
13 You . . . turn on the light; I can see quite well.
14 You . . . strike a match; the room is full of gas.
15 You . . . talk to other candidates during the exam.
16 We . . . make any more sandwiches; we have plenty now.
17 You . . . put salt in any of his dishes. Salt is very bad for him.
18 You . . . take anything out of a shop without paying for it.
19 You . . . carry that parcel home yourself; the shop will send it.
20 You . . . clean the windows. The window-cleaner is coming tomorrow.
21 Mother to child: You . . . play with matches.
22 Church notice: Visitors . . . walk about the church during a service.
23 1... go to the shops today. There is plenty of food in the house.
24 You . . . smoke in a non-smoking compartment.
25 Police notice: Cars . . . be parked here.
26 We . . . open the lion's cage. It is contrary to Zoo regulations.
27 You . . . make your bed. The maid will do it.
28 I want this letter typed but you . . . do it today. Tomorrow will do.
29 I'll lend you the money and you . . . pay me back till next month.
30 We . . . climb any higher; we can see very well from here.
31 You . . . look under the bed. There isn't anybody there.
32 You . . . ask a woman her age. It's not polite.
33 You've given me too much. ~
You . . . eat it all.
34 We . . . forget to shut the lift gates.
35 Mother to child: You . . . interrupt when I am speaking.
36 If you want the time, pick up the receiver and dial 8081; you . . . say anything.


must + perfect infinitive is used for affirmative deductions.
can't/couldn't + infinitive is used for negative deductions.
needn't + perfect infinitive is used for a past action which was unnecessary but was performed.