Test there is/there are

There ... a cloud in the sky.

There ... any clouds.

... there any clouds? - Yes, there are.

There ... 12 months in a year.

There ... three months in spring.

There ... one bird in the tree.

There ... some birds in the tree.

There ... any bird.

... there any bird? - Yes, there is.

... there any birds? - No, there aren't.

... there any flower? - Yes, there is.

There ... any flowers.