Question

III. Correct the error if necessary. 1. Since when are they waiting for us? 2. I have been looking for my passport since I came home. 3. His friend have been having this building for ten years. 4. Through the history people are always wanting to fight for new lands. 5. We received his letter a week ago and have tried to find time to write him back ever since. 6. Do you know where Nick is? I have looked for him for the past twenty minutes.

Answer 1

1. Since when have they been waiting for us?
  2. I have been looking for my passport since I returned home.
  3. His friend has had this building for ten years.
  4. Throughout history, people always want to fight for new lands.
  5. We received his letter a week ago and have since tried to find time to write him an answer.
  6. Do you know where Nick is? I have been looking for it for the last twenty minutes.

Answer 2

III. Correct the errors if necessary:

1. Since when have they been waiting for us? (The correct tense for ongoing action is present perfect continuous.)
2. I have been looking for my passport since I came home. (No correction needed; the sentence is grammatically correct.)
3. His friend has been owning this building for ten years. (Change "have been" to "has been" to agree with the singular subject "His friend.")
4. Throughout history, people have always wanted to fight for new lands. (Change "Through" to "Throughout" to indicate the duration of history.)
5. We received his letter a week ago and have been trying to find time to write him back ever since. (Change "have tried" to "have been trying" to indicate the ongoing effort to find time.)
6. Do you know where Nick is? I have been looking for him for the past twenty minutes. (No correction needed; the sentence is grammatically correct.)