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Problems With Modifiers (9): Time Modifiers.

([She] [has] [been] in the U.S. [for] [six months])

- (S): She
- (HAVE): has
- (participle): been
- in the U.S.
- (for): for
- (quantity of time): six months

([She] [has] [been] in the U.S. [since] [june])

- (S): She
- (HAVE): has
- (participle): been
- in the U.S.
- (since): since
- (specific time): june

([She] [has] [been] in the U.S. [since] [six months] [ago])

- (S): She
- (HAVE): has
- (participle): been
- in the U.S.
- (since): since
- (quantity of time): six months
- (ago): ago

Remember that a quantity of time may be several days - a' month, two years, etc. A specific time may be Wednesday, July, 1960, etc.

Avoid using (for) before specific times. Avoid using (for) with (ago). Avoid using (before) after (HAVE) and a participle.


Examples:

Incorrect: Mary has been on a diet (since) (three weeks).
Correct: Mary has been on a diet (for) (three weeks).

[OR]

Correct: Mary has been on a diet (since) (three weeks ago).

Incorrect: She has been living here (before) (April).
Correct: She has been living here (since) (April).

Incorrect: We haven't seen him (since) (almost a year).
Correct: We haven't seen him (for) (almost a year).

[OR]

Correct: We haven't seen him (since) (almost a year ago).

Incorrect: We have known each other (before) (1974).
Correct: We have known each other (since) (1974).

Incorrect: He has studied English (since) (five years).
Correct: He has studied English (for) (five years).

[OR]

Correct: He has studied English (since) (five years ago).

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