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have they haven’t they don’t they do they
went; British have been; America have gone; American have been to; Britain
as America’s greatest writer was America’s greatest writer America’s greatest writer to have been America’s greatest writer
A. have been travelling travelled was travelling travel
peasants lead similar Chinese irrigating system is more impressing than that in America peasants in Midwest America raise more corns while Chinese peasants raise more rice peasants in Midwest America raise more rice while Chinese peasants raise more corn
so have I so I have I have so so did I
I would be here I have been here I had been here I would have been here
I would be here I have been here I had been here I would have been here
have been teaching was teaching taught had taught
a number of books and plays have also been written by Sonia Sanchez Sonia Sanchez has also written a number of books and plays a number of Sonia Sanchez's books and plays have been written there have been a number of books and plays written by Sonia Sanchez
have they haven’t they don’t they do they
would be have been had been would have been
Have; gone Has; been Have; been Has; gone
have they haven’t they don’t they do they
it；it that；which one；there the one；it
Have… gone to Have… gone in Have… been to Have… been in
as America's greatest writer was America's greatest writer America's greatest writer to have been America's greatest writer
have become; will I separate have become; I will separate have been; will I be separated have been; I was separated
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