Page 92 - Oxford_English_Grammar_Course_Basic_2015

mustn't and don't have to We mustn't wake the baby.

D 1must not go you must not go he/she/it must not go etc

B 1do not have to go you do not have to go he/she/it does not have to go etc
Contractions: mustn't; don't have to

Must has two negatives (B): we use mustn't or must not when we mean 'Don't do this'.
we use don't / do not have to when we mean 'This isn't necessary'.
You mustn't smoke here. You mustn't take pictures here. We mustn't wake the baby.
You don't have to pay now;you can pay when the work is finished.
We don't have to hurry - we're early.

Complete the sentences with mustn't and the verbs in the box.

let lig h t/ make play play smoke wash

At a campsite: 3 animals run around,
► yout kvcucstiA/'t lig h t ^ res 4 in the toilets,
1 ........................................dishes in the showers. 5 football.

2 ........................................loud music. 6 noise after 10 pm.

0 Put the beginnings and ends together. Add don't have to and verbs from the box.

drive give make make post speak wake/

0 You dovc’t have to wafee mpnp. A 1 can walk........
1 You . B I'll buy The Times at the station........
2 You . C Cathy's going to the post office........
3 You . D I'll just have coffee........
4 You ......................................me your newspaper; E I've got an alarm clock........

5 You ......................................those letters; F everybody here understands English........
6 You . G I'll have lunch in the canteen........

^ Mustn't or don't have to?

► You pay John - he hasn't done any work

► You pay John - I've already paid him.
1 You....................................... stay up late tonight - you've got school tomorrow morning.
2 You....................................... stay up late to wash the dishes - I'll wash them in the morning.
3 We.........................................leave the door open - the rain will come in.

4 We.........................................leave the door open - Peter has got a key.
5 You....................................... write to Deepak about this - I've already written to him.
6 You........................................write to Deepak about this - if you do, he'll tell everybody.
7 You........................................drive so fast - the police will stop you.
8 You....................................... drive so fast - we've got a lot of time.
9 I .........................................look in the cupboard again - I've looked in there twice.
10 I .........................................look in the cupboard - Holly has put my birthday present in there.
11 You...................................... phone Maxine now - she's probably asleep.

12 You...................................... phone Maxine now - tomorrow will be fine.

In some answers, both contracted forms (for example I'm, don't) and full MODAL VERBS 77
forms (for example lam, do not) are possible. Normally both are correct.