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

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

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

4. Did Mr Robinson buy a poster? - Yes, he 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? - No, we didin't

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

1. Ba/ teach Liz Vietnamese// Yes
 → Did Ba teach Liz Vietnamese? - Yes, he did
2. he/ mail his friend a postcard// No
 → Did he email his friend a postcard? - No, he didn't
3. they/ return home/ yesterday// No
 → Did they return home yesterday? - No, they didn't
4. Mrs. Robinson/ buy a poster// Yes
 → Did Mr Robinson buy a poster? - Yes, he did
5. you/ send me those flowers// Yes
 → Did you send me those flowers? - Yes, i did
6. she/ receive many gifts// No
 → Did she receive many gifts? - No, she didn't
7. we/ meet her at the meeting/ last week// Yes
 → Did we meet her at the meeting last week? - No, we didin't
8. they/ live in this town/ in 1990// No
 → Did they live in this town in 1990? - No, they didn't