Uses of Present Perfect - Intermediate

The present perfect is used when the time period has NOT finished:	I have seen three movies this week. (This week has not finished yet.)
	The simple past is used when the time period HAS finished:	I saw three movies last week. (Last week has finished.)
	The present perfect is often used when giving recent news:	Martin has crashed his car again. (This is new information.)
	The simple past is used when giving older information:	Martin crashed his car last year. (This is old information.)
	The present perfect is used when the time is not specific:	I have seen that movie already. (We don't know when.)
	The simple past is used when the time is clear:	I saw that movie on Thursday. (We know exactly when.)
	The present perfect is used with for and since, when the actions have not finished yet:	I have lived in Victoria for five years. (I still live in Victoria.)