Ex :1

1.was

2.were

3.is

4.was

5.was-was

6.are-were

7.is

8.Were

Ex:2

1. She bought a lot of souvenirs last summer vacation.

2.My mother gave me a yellow cap.

3.They arrived at the airport at eight o'clock this morning.

4.I spoke to her about my vacation.

5.Mr.Quang taught mathematics for many years.

6.I saw you at the party last night.

7.The children were very happy in their trip to Nha Trang.

8.Minh put the cake on the table.

9.They lived here two years ago.

10.Nga was late for school yesterday morning.

Ex:3

1.Did Ba teach Liz Vietnamese? Yes, he did.

2.Did he mail his friend a postcard? No, he didn't.

3.Did they return home yesterday? No, they didn't.

4.Did Mrs.Robinson buy a poster? Yes, she did.

5.Did you send me those flowers? Yes, I did.

6.Did she receive many gifts? No, she didn't.

7.Did we meet her at the meeting last week? Yes, we did.

8. Did they live in this town in 1990? No, they didn't.