IV. Turn the sentences into negative and interrogative forms. (chuyển những câu sau sang thể nghi vấn và phủ định)
Ex :    + She went to the zoo yesterday.
  Did she go to the zoo yesterday ?
      She didn’t go to the zoo yesterday.
  + You watched the football match on TV last night.
  Did you watch the football match on TV last night ?
             You didn’t watch the football match on TV last night.
1. Duong and I played tennis yesterday.
  => did duong and you play tennis yesterday

=> duong and i didn't play tennis yesterday  
2. She visited her parents two days ago.
  => did she visit her parents 2 days ago
  => she didn't visit her parents 2 days ago
3. They saw her three months ago.
  => did they see her 3 months ago
  => they didn't see her 3 months ago
4. They lived in this town in 2000.
  => did they live in this town in 2000
  => they didn't live in this town in 2000
5. I was ill last week.
  => was you ill last week
  => i wasn't ill last week
6. The children went to the zoo yesterday.
  => did the children go to the zoo yesterday
  => the children didn't go to the zoo yesterday
7. We met her at the meeting last week.
  => did you meet her at the meeting last week
  => we didn't meet her at the meeting last week
8. They bought a new house last month.
  => did they buy a new house last month 

=> they didn't buy a new house last month