Ответ:

Ex.5:

1) There are flowers in the garden. 2) There is milk in the cup. 3) There are English books on the table. 4) There are houses in the street. 5) There is an apple in the box.

Ex.7:

1) Richard is going to school. Is Richard going to school? Yes, he is. No, he is not. Richard is not going to school.

2) We are living in that house. Are we living in that house? Yes, we are. No, we are not. We are not living in that house.

3) My mother is working in this garden. Is my mother working in this garden? Yes, she is. No, she is not. My mother is not working in this garden.

Ex.8:

1) She helped me. Did she help me? Yes, she did. No, she did not. She did not help me.

2) The cat slept. Did the cat sleep? Yes, it did. No, it did not.  The cat did not sleep.

3) We wrote a letter. Did we write a letter? Yes, we did. No, we didn`t. We didn`t write a letter.