They and are make up they're
It is
Would've is would have
'She has' are two individual words, not compound; you can make a one word contraction she's meaning she has.
The contraction "o'clock" is formed from the words "of" and "the clock." It is a shorthand way of indicating the time in reference to the clock. The "o'" stands for "of," while "clock" remains unchanged.
The contraction "mustn't" means "must not." Must is an auxiliary verb and not is an adverb.
The two words that make up the contraction "can't" are "cannot."
"who" and "will" make up the contraction "who'll."
It will.
"You" and "would" make up the contraction "you'd".
"you" and "would" make up the contraction "you'd."
It is
Does not.
will + not
You are.
"Weren't" is a contraction. It is composed of the words "were" and "not".
"Let us" combine to form the contraction "let's".
Won't is a contraction of will not.