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Should, shouldn't, ought to, must, mustn't, have to and don't have to
Transcript of Should, shouldn't, ought to, must, mustn't, have to and don't have to
To express prohibition we use
about the past. For prohibitions in the past we can use
not allowed to
eat chocolate before dinner
To say that there is not obligation, or that it is not necessary, we use
don't have to
To express obligation, we use
To give somebody advice we use
or, less often
for strong advice:
get some new shoes
(I think it is a good idea for you to get some new shoes)
to relax now
(I think it is a good idea that you should relax now)
Particularly in the negative,
is more common that
go outside today as it is raining.
The question form:
Should I/she/we etc ........
We often use
) to talk about the right thing to do, but which is different from what actually happens:
do more homework instead of watching TV.
read more books instead of playing video games.
We use must when the obligation is something we agree with (more personal):
We use have to when the obligation comes from somebody else: (external)
You must hand in your homework on Monday.
My teacher has given me a lot of homework which I have to do for Monday.
be careful if you go rock climbing.
The question forms are must I/you, etc and do I /you etc have to.
Must we stop writing now?Do they have to wear uniform at school?
go in there
speak during an exam
Do not use
with prohibition (different definition: not necessary)
This is extra work, you
don't have to
learn all the vocabulary in this book.