There is no contraction. There is a contraction we'dmeaning either we would or we had.
There is no contraction for the conditional auxiliary verb "could."But there is one for the auxiliary pair "could have", which is could've.
you'll
Since the contraction for will not is won't, the contraction for he will not is he won't.You could also use he'll not, but it is not as common.
the answer is couldn't
Could've
Shouldn't
No, the word "could've" is a verb contraction; a shortened form of "could have".
contact
couldn't
Could've
How about " contraction" ? Or you could have hemoglobin reactional dispersal of sperm