Answers

2015-06-01T12:36:40+05:30
We use present perfect tenses when a unfinished actions has started in the past and is continue in the present.
Subject + has/have + 3rd form of verb or past participle + subject
Eg. - She has learnt a English.
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2015-06-01T13:08:41+05:30

we use the present perfect tenses to describe the action which is been done at present but which is continued from the past
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