PRESENT PERFECT PROGRESSIVE

PRESENT PERFECT CONTINUES is used to describe an
action which happened in the past and it has been continued up to uncertain time in  the future.
Present Perfect Continues  usually focuses on the duration of
an action / activity or since when the action / activity begun.

Connectors : for, since
For example :    S + have / has + been + V1 ing
1. She has been waiting for 30 minutes.
2. He has been studying English for 3 years.
3. I have been teaching English for 7 years.
4. They have been studying here since last year.
For example :

S + have / has + not + been + V1 ing
1. She has not been waiting for 30 minutes.

2. He has not been studying English for 3 years.

3. I have not been teaching English for 7 years.

4. They have not been studying here since last year.
For example :
Have / has + S + been + V1 ing?
1. Has he been waiting for 30 minutes?
2. Has she been studying English for 3 years?
3. Have you been teaching English for 7 years?
4. Have they been studying here since last year?

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