помогите пожалуйста разобраться в 16 упражнение до завтра

1. Have you been to London? yes, I was there last summer.

2. She has never flown a kite.

3. The tourist has just crossed the square.

4. They crossed the street, turned to the left and saw the boat.

5. We have just cleaned the house.

6. The students visited the Science Museum yesterday. They spent