2. (-) They aren't nurses.

(?) Are they nurses?

3. (-) I am not an engineer.

(?) Are you an engineer?

4. (-) Those aren't his pens.

(?) Are those his pens?

5. (-) She is not doing her homework now.

(?) Is she doing her homework now?

6. (-) There isn't a television in my bedroom.

(?) Is there a television in my bedroom?

7. (-) They aren't watching TV at the moment.

(?) Are they watching TV at the moment?

Thì HTĐ với động từ tobe:
(+) S is/am/are...

(-) S is/am/are not...

(?) Is/Am/Are S...?

Thì HTTD:
(+) S is/am/are Ving

(-) S is/am/are not Ving

(?) Is/Am/Are S Ving?