PAST SIMPLE
WAS / WERE or sing - SANG - sung
FINISHED TIME
I lived in Brazil in 1998
DEFINITE TIME
I saw the Eiffel tower in 2010.
SERIES OF FINISHED ACTIONS
He flew to Spain and then drove to Portugal.
REPEATED ACTIONS
He went to the gym every week last year
Present Perfect
have/has + past participle (SUNG)
UNFINISHED TIME
I have lived in Brazil (since 1998)
INDEFINITE TIME
I have seen the Eiffel tower.
EXPERIENCE
He has travelled to the south of Europe by plane and car.
RESULT
He is not home, he has gone to the gym .