It is an incorrect contraction. Both words should be spelled out (might have). We may elide them when speaking, but it is not grammatically correct to contract them.
Might've
There is no contraction for I was. There is a contraction for I am (I'm) and for I have (I've).
There is no contraction. The contraction we're means "we are."
There is no contraction of we'll. It is a contraction, meaning "we will."
There is no contraction. The word isn't is the contraction, meaning "is not."
Might've
The word might've is not actually in most dictionaries but has become quite common to use as a contraction of the words 'might have'. The contraction made up of the auxiliary (helper) verb 'might' and the main verb 'have' to mean 'may have'. Might've is used as a verb but I recommend that you only use it for personal writing not for school or business; and don't forget the apostrophe.
I think it mightve been private lewis
There is no contraction for were you. There is no contraction for you were.There is a contraction for "you are" (you're).
There is no contraction for "its not."There is a contraction for "it is" (it's).There is a contraction for "is not" (isn't).
He's already IS a contraction. It is a contraction of he is.
"They've" is the contraction for 'they' and 'have'.
It's is the contraction of it has and it is.
We're is a contraction of we are.
The contraction for he will is He'll
There is no contraction. The contraction we're means "we are."
There is no contraction. There is a contraction doesn't which means "does not."