1) The children have been in the cinema.

Have children been in the cinema?

The children haven't been in the cinema.

2) Nick has never builta house.

Has Nick built a house?

Nick hasn't built a house.

3) You have ever visited Greece.

Have you ever visited Greece?

You haven't ever visited Greece.

4) She hasn't come yet.

Has she come yet?

5) Our friends have just arrive in Moscow.

Have our friends just arrive in Moscow?

Our friends haven't just arrive in Moscow.