Submitted by reshmipriyan (not verified) on Tue, 05/25/2010 - 07:37.
i think the simple past tense refer to those events which have completed in the past .but the present perfect tense shows events which have completed at the time of saying and have an effect in the present.while present perfect continuous tense means an event which have been started at the present time and is continuing at the time of saying
i think the simple past tense refer to those events which have completed in the past .but the present perfect tense shows events which have completed at the time of saying and have an effect in the present.while present perfect continuous tense means an event which have been started at the present time and is continuing at the time of saying