Question

Read these sentences. Correct those that are incorrect.
1. I've been waiting since half an hour.
2. We've known about the exams for two days.
3. We swam for a long time.
4. How long have you known Nasreen for?
5. I'm swimming for three years.
6. How long have you been in Bhopal for?
7. I lived in Bhopal for a year.
8. He has been batting for all day.
9. She has had this bike for six months.
10. I've had a headache for hours.
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Answer 1

Answer:

1. I've been waiting since half an hour.

• Correction: I've been waiting for half an hour.

2. We've known about the exams for two days.

• Correct!

3. We swam for a long time.

• Correct!

4. How long have you known Nasreen for?

• Correct!

5. I'm swimming for three years.

• I'm swimming since three years.

6. How long have you been in Bhopal for?

• Correct!

7. I lived in Bhopal for a year.

• Correct!

8. He has been batting for all day.

• Correction: He has been batting since all day.

9. She has had this bike for six months.

• Correction: She has had this bike since six months.

10. I've had a headache for hours.

• Correct!

Explanation:

Look at the following sentences:

• He has been studying for hours.
• He has been studying since morning.

Thus, let's consider that

★ 'since' is used with a particular point in time

★ 'for' is used with a period of time

These words are mainly used with perfect continuous tense, so it'll be lot easier to know which word to use!! :D