Minggu, 30 Juni 2013


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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