1.
Present Perfect Tense
The present
perfect expresses the idea that something happened before now, at an
unspecified time in the past. The exact time it happened is not important. If
there is a specific mention of time, the simple past is used. The present perfect also expresses the
repetition of an activity before now. The exact time is not important.
Pattern
(+) S + have/has + V3 + O
(-) S + have/has + not + V3 + O
(?) have/has + S + V3 + O?
Time which are
used in present perfect : since, for, twice, yet, just, already.
Since + a
particular time
For + a duration
of time
Examples :
a.
I have never seen snow.
b.
I have been here since seven o’clock.
c.
I have had this same pair of shoes for three
years.
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