1. (+) There is somebody in our garden. (?) (-) (-)

Ответ:

1. (+) There is somebody in our garden.

(?) Is there anybody in our garden?

(-) There isn't anybody in our garden.

(-) There is nobody in our garden.

Ответ: Is there anybody in our garden?

Отлично! Продолжай в том же духе, и у тебя всё получится!