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You should pay close attention to how contractions are formed. In most cases we just put two words together (like "do" and "not") and replace the "o" in "not" with an apostrophe (as in "doesn't"). But there are exceptions.
will not --> won't let us --> let's
CONTRACTION WORD PAIR
don't do not
can't can not
won't will not
haven't have not
hasn't has not
wouldn't would not
shouldn't should not
didn't did not
doesn't does not
mustn't must not
couldn't could not
let's let us