Let's go out for dinner.
`->` Why don't we go out for dinner?
We last my old friend was 2 years ago.
`->` We have not seen my old friend for 2 years.
Although he was ill, he went to school.
`->` Despite his illness, he went to school.
We did not go out for dinner because it rained heavily.
`->` Because of the heavy rain, we didn't go out for dinner.
My teacher said to her students "You must do homework"
`->` My teacher said to her student that they must do their homework.