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Do educated native speakers ever use sentences like

I could have married her if she agreed.
I could marry her if she had agreed.

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Russ90

Do educated native speakers ever use sentences like
I could have married her if she agreed.
I could marry her if she had agreed.

Those are mixed conditionals, and they don't usually work. The pattern of the second one does occasionally make sense, however, if you have the right situation.

If only I had paid closer attention in class years ago, I could help you now with your algebra homework.

CJ

Comments  
Russ90

Do educated native speakers ever use sentences like
I could have married her if she agreed.
I could marry her if she had agreed.

No. The tenses clash to the trained ear, and to many others, too, I daresay.

 CalifJim's reply was promoted to an answer.