Transform the relative clauses into adjectives using the participle form!
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Jenny's father is a man who works very hard.
Jenny's father is a .

He had some news for her which surprised her very much.
He had some very for her.

A friend from France who only spoke French wanted to visit them.
A from France wanted to visit them.

He had an idea how to learn French which fascinated her.
He had a to learn French.