present perfect simple & present perfect continuous

PRESENT PERFECT SIMPLE
The present perfect simple forms with the present perfect simple verb to have most of the past participle of the verb principal.
USE
The present perfect simple is used to to discuss actions in the past that have any impact on this: - Actions that occurred in the past without specifying the time they occurred.
Ex. I've met your mother in the supermarket.

- With the adverb just expressed actions just happen.
Ex. We've just come back from london.

- With prepositions for and since.
Ex. We have not eaten rice for two months.
Ex. He has been abroad since 2000.

-With time of expressions that indicate a period of time at the moment to speak not yet been completed.
Ex. You have not done much today.

PRESENT PERFECT CONTINUOUS
The present perfect continuous is formed with the present perfect tense of the verb to be more form-ing the main verb.
USE
- To speak of an activity that began in the past and continuing into the present. Often accompanied by prepositions for or since.
Ex. We've been studyind since 9 o'clock.

- To talk about an action that began in the past and may have recently finished in a time of the present.
Ex. You've been sleeping all morning.

- To speak of past actions just completed, and whose outcome is obvious.
Ex. Have you been swatting flies?



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