A contraction means to make smaller. "They" and "Have" are already as small as they can get.
If you meant to say, "They are" and "Have not", then the contracted form of those words is "They're" and "Haven't", respectively.
The contraction for "we have" is "we've."
Didn't is a contraction of the words "did" and "not". There is no 'contraction' for this word.
The contraction is "I'll".
I + will = I'll
The contraction for the words would not: wouldn't
There is no contraction for the words did you.
contraction of the words you will: you'll
There is no contraction for the words "did you".
The contraction for "we have" is "we've."
Didn't is a contraction of the words "did" and "not". There is no 'contraction' for this word.
Haven't is the contraction of have not.
contraction made in the words you will: you'll
The contraction is "I'll".
Contraction word made from the words they and are is they're.
I + will = I'll
contraction made from the two words you will: you'll
Contraction word for she will: she'll