Chapter 6.5: Modal verbs for obligation and permission

Can-do statement: I can express obligation and permission

 

Modal verbs for obligation and permission:

 

You use must, need to, have to and can to express obligation and permission.

 

When to use modal verbs for obligation and permission:
Necessary Not Necessary Permitted Not Permitted

Have to/

Has to

Don't have to/

Doesn't have to

Can

 

Can't

 

Need to/

Needs to

Don't need to/

Doesn't need to/

Needn't

 

Mustn't

 

Must      

 

Note:

You usually use have to (not must) and can't (not musn't) to talk about rules or arrangements:

EXAMPLE: I have to (NOT must) work long hours. BUT:

                   I must (NOT have to) remember to shave.

6.5 Kennisclip https://www.youtube.com/watch?v=fXJ87wO484E