Easy Paraphrases:

I walked out on this girl.

This ...

The train didn't come for over an hour.

It was over ...

It would be good if you left us alone.

You had ...

The police didn't capture any of the escaped prisoners.

None ...

I think it wise to go to the dentist twice a year.

I like ...

They are very hard to paraphrase. They stand pretty well on their own.

One: This left her alone.

Two: It was overdue.

Three: You had better leave us.

Four: None were captured.

I walked out on this girl.

This is the girl I walked out on.

The train didn't come for over an hour.

It was over an hour before the train came.

It would be good if you left us alone.

You had better leave us alone.

The police didn't capture any of the escaped prisoners.

None of the escaped prisoners was captured by the police.

I think it wise to go to the dentist twice a year.

I like ... ? (nothing in the sentence indicates liking)