Level 3 Unit 12 -
Don't have to, don't need, needn't, mustn't

There are two logical answers to SOME questions (with small white squares).
Tick both.
You can do this exercise two or three times: It will be different each time

Click on the boxes to tick them. (or to cancel a tick).

Negatives of auxilliaries of obligation

"HAVE TO" and "MUST" are very similar in the affirmative but different in the negative:

MUST NOT is prohibitive. It is forbidden:

You MUST NOT walk on the grass in the park.
You MUST NOT bring cocaine into the country.
In conversation it is usually contracted:
Johnny! You mustn't play with matches!

DON'T HAVE TO:
Is permissive. There is no obligation.

I DON'T HAVE TO work on Saturday (but my boss will be delighted if I do!)
You DON'T HAVE TO put milk in your tea. (Unless you are English and it is for breakfast...)


DON'T NEED TO:
Is almost the same as DON'T HAVE TO
It can be used in either of the two examples above.

DON'T NEED can be used with a noun and of course:

I DON'T NEED a car (I like public transport) is quite different from
I DON'T HAVE a car (but I need on!)

NEEDN'T is the same as DON'T NEED TO when used with a verb:
You NEEDN'T come in early tomorrow. or
You DON'T NEED TO come in early tomorrow.

NEEDN'T cannot be used with a noun.

In this exercise there are some questions with two right answers. Tick them both.