Chan-Seung Lee
Joined: 03 Dec 2005
Posts: 1032
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 Posted: Tue Jul 29, 2008 8:31 am Post subject: have p.p. |
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1.These past two years, I have been studying cancer survivors.
2.These past two years, I have studied cancer survivors.
3.For centuries, people believed that sleepwalkers were possessed by evil spirits.
4.For centuries, people have believed that sleepwalkers were possessed by evil spirits.
5.Until very recently, it was universally believed that men are endowed with more intelligence than women.
6.Until very recently, it has been universally believed that men are endowed with more intelligence than women.
7.My mother was sleeping when I entered the room.
8.My mother had been sleeping when I entered the room.
9.My mother was sleeping for three hours when I entered the room.
10.My mother had been sleeping for three hours when I entered the room.
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1.Which is correct, #1 or #2?
2.Which is correct, #3 or #4?
3.Which is correct, #5 or #6?
4.Which is correct, #7 or #8?
5.Which is correct, #9 or #10?
Thanks. |
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