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having been invented it one of whom invented who had invented it to have been invented
is are have been had been
have killed had been killed were killed had killed
did I meet I met had I met I had met
broke out was broken out had broken out had been broken out
was there has there been is there had there been
It is said that ten people are killed in the accident. It was said that ten people were killed in the accident. It was said that ten people had been killed in the accident. It is said that ten people were killed in the accident.
people knew people had known did people know had people known
used to has to had better had to
is still increasing are still increasing had been increasing have been increasing
have killed had killed have been killed had been killed
was over has been over being over had been over
had been have been have gone had gone
wouldn’t be will not have been wouldn’t have been had been
had realized; wouldn’t be realized; wouldn’t be had realized; wouldn’t have been realized; wouldn’t have been
have invited have been invited had invited had been invited
have been had been had gone have gone
have injured；admitting have been injured；being admitted had injured；to admit had been injured；admitted
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