Study these sentences. Then complete rules 1-4.
You have to be a really strong swimmer.
I must get really good marks.
I don't have to make a decision right now.
My friends say I should become a nurse.
You mustn't do something you aren't sure about.
I don't need to do an apprenticeship.
RULES 1. We use ……….. to say something is necessary because of a situation or a rule. We use ……… and need to when the speaker feels that it is very important to do something, or when we talk about written rules. 2. We use ….…… and its negative form ………. to give advice, or to say something is a good or bad idea. 3. We use ………. to talk about something that is prohibited. 4. We use ....…. and ………. something to say isn't necessary. |
1. must/ have to/ need to
2. should/ shouldn't
3. mustn't
4. don't have to/ don't need to
1. We use MUST to say something is necessary because of a situation or a rule.
We use HAVE TO and NEED TO when the speaker feels that it is very important to do something, or when we talk about written rules.
2. We use SHOULD and its negative form SHOULDN'T to give advice, or to say something is a good or bad idea.
3. We use MUSTN'T to talk about something that is prohibited.
4. We use DON'T HAVE TO and DON'T NEED TO to say something isn’t necessary.
