Contractions are often used to speed up and shorten some common word combinations:
Contraction | Meaning |
I’m
I’ve I’ll I’d |
I am
I have I will I had or I would |
you’re
you’ve you’ll you’d |
you are
you have you will you had or you would |
he’s
he’ll he’d |
he is or he has
he will he had or he would |
she’s
she’ll she’d |
she is
she will she had or she would |
it’s
it’d |
it is or it has
it had or it would |
we’re
we’ve we’ll we’d |
we are
we have we will we had or we would |
they’re
they’ve they’ll they’d |
they are
they have they will they had or they would |
there’s
there’ll there’d |
there is
there will there had or there would |
aren’t
can’t couldn’t daren’t didn’t doesn’t don’t hadn’t hasn’t haven’t isn’t mightn’t mustn’t needn’t oughtn’t shan’t shouldn’t usedn’t wasn’t weren’t won’t wouldn’t mayn’t (rare) let’s ain’t |
are not
cannot could not dare not did not does not do not had not has not have not is not might not must not need not ought not shall not should not used not was not were not will not would not may not let us am not, are not, is not, have not or has not |
Source: Swan, Michael (1995), Practical English Usage, Oxford University Press, Oxford UK.