Given a sentence, generate a new sentence by performing small changes on the sentence. Here, make sure that the changes are semantically related and syntactically similar to the input. And the generated sentence should have high commonsense plausibility, that is to have reasonable probability of it being true.

You would learn a language because you want to correspond with a family.
You would help a mission because you want to correspond with a buddy .

A coat of happiness does n't make us happier .
A lot of sleep doesn't make us happier.

You are embarrassed to find a shark in open sea .

You are likely to find a catch in open sea .