There is no contraction of what do. Recording some informal speech, we may use waddaya for "what do you," as in "Waddaya think that is?" Remember, all contractions are informal, and not to be used in writing except when recording informal speech.
You don't write it as an apostrophe; you write it as a contraction. "It's" is a contraction of it is and it has.
it has = it's
Yes. It is a contraction of the words should and have. Many people incorrectly write this as "should of".
There is no contraction. The contraction we're means "we are."
There is no contraction for I was. There is a contraction for I am (I'm) and for I have (I've).
You don't write it as an apostrophe; you write it as a contraction. "It's" is a contraction of it is and it has.
The contraction for "you have" is "you've."
The contraction of "you would" is "you'd."
The contraction for "shall not" is "shan't."
you had = you'd
it has = it's
doesn't
you're
The contraction of will not is won't. This is one of the many peculiarities of the English language.
"how does" can be written as "how's" but this is not very common ("How's" usually means "how is").
Yes. It is a contraction of the words should and have. Many people incorrectly write this as "should of".
As the contraction "We'll"