几道改同义句的英语题目

A:My cousins fell asleep ten minutes ago.
B:My cousins [has been asleep] for ten minutes.
A:The paper factory opened in 1999.
B:The paper factory [has been open] since 1999.
A:The football match began half hour ago.
B:The football match [has been on] for half an hour.
A:Her grandparents died two years ago.
B:Her grandparents [have been dead] for two years.
A:They got to Shanghai four months ago.
B:They [have been in] Shanghai for four months.
A:He left the company at ten past eight.
B:He [has been away] from the company since ten past eight.
A:The class ended five minutes ago.
B:The class [has been over] for five minutes.
A:I put on the coat at nine o'clock.
B:I [have worn] the coat since nine o'clock.
A:He arrived here two hours ago.
B:It is [two hours since] he arrived here.
A:We got to know each other in 1989.
B:We [have known] each other since 1989.