Both the present perfect simple and the present perfect continuous link the past to the present (see the lesson about the present perfect).However there are some differences of emphasis because , like all the continuous forms , the present perfect continuous emphasises duration (and sometimes repetition)while the simple form emphasises completion and achievement.
ex : I have written some letters (present perfect simple)
I have been writing these letters for two hours.(present perfect continuous)
Form of the present perfect continuous:
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To be + verb + ing
in the present perfect
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NB: some verbs cannot be put in the continuous form (see the lesson about the present continuous.
verb to work (present perfect continuous)
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Affirmative
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Negative
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| I have been working (I've been working) |
I have not been working (I haven't been working) |
| you have been working (you've been working) |
you have not been working (you haven't been working ) |
| He has been working (he's been working ) |
he has not been working (he hasn't been working ) |
| she has been working (she's been working) |
she has not been working (she hasn't been working) |
| It has been working (it's been working ) |
it has not been working (it hasn't been working ) |
| we have been working (we've been working) |
we have not been working (we haven't been working) |
| you have been working (you've been working) |
you have not been working (you haven't been working) |
| they have been working (they've been working) |
they have not been working( they haven't been working) |
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