Use of 'Since' and 'For'

How to use 'Since' in Perfect & Perfect Continues Tense 
1.  When Time is specified, or 'time' has its particular name, such as Morning, Evening, Noon, Monday, March, 2020, 1980 etc. 
For Example:
  • He has been studying since morning.
  • He has not seen her since Monday.
  • She had been studying Geography since January.
  • I have not seen him since last night.
2. When Past Indefinite is mentioned, such as 
  • He has been in hospital since he met an accident.
  • He has not touched any book since he left the school.
3. 'for' is used for a period of time
For example:
  • He has been studying books for two hours.
  • They have been waiting for me for three weeks.
  • They have been playing with toys for hours.
  • I knew him for ten years.
4. 'ago' is used with past Indefinite Tense.
For example:
  • He went to Dubai two days ago
  • They met me last night.
  • They took our lunch an hour ago .
  • He died two years ago.

1. I have been watching a movie ___ an hour.


ANSWER= (B) for
Explanation: I have been watching a movie ___ an hour. (Present Perfect Continuous Tense)

2. Where have you been ____ last night?


ANSWER= (A) since
Explanation: Where have you been since last night? (Present perfect Tense)

3. I passed my M.A  ten years ____ .


ANSWER= (B) age
Explanation: I passed my M.A ten years ago. .(Past Indefinite Tense)

4. What have you been doing ___ morning?


ANSWER= (A) since
Explanation: What have you been doing since morning? (Present Perfect continuous Tense)

5. They have been married ___ 20 years.


ANSWER= (B) for
Explanation: They have been married for 20 years. (Present Perfect Tense)

6. She has been ill ____  two weeks.


ANSWER= (B) for
Explanation: She has been ill for two weeks. (Present Perfect Tense)

7. What have they been studying ___ childhood?


ANSWER= (A) since
Explanation: What have they been studying since childhood? (Present Perfect Continuous Tense)

8. We have been watching a movie ___ two hours.


ANSWER= (B) for
Explanation: We have been watching a movie for two hours. (Present Perfect Continuous Tense)

9. She has been studying Geography ___ six months.


ANSWER= (B) for
Explanation: She has been studying Geography for six months. (Present Perfect Continuous Tense)

10. Where have you been prowling ____ noon?


ANSWER= (A) since
Explanation: Where have you been prowling since noon? (Present Perfect Continuous Tense)

11. We went to England ten years ____ .


ANSWER= (C) ago
Explanation: We went to England ten years ago .(Past Indefinite Tense)

12. We have been working on this project ____ May. .


ANSWER= (A) since
Explanation: We have been working on this project since May. (Present Perfect continuous Tense)

13. They have been preparing for exams ____ a month.


ANSWER= (B) for
Explanation: They have been preparing for exams for a month. (Present Perfect continuous Tense)

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