Verb+back

 Answer the questions. Give examples and reasons. 

When someone leaves you a message on your phone, do you usually call them back immediately?

If you buy something online that isn't exactly what you wanted, do you always send it back?

Have you ever lent somebody money and they didn't pay you back?

When you come back after a holiday do you usually feel better or worse than before?

When you borrow something from a friend, do you usually remember to give it back?