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during which time for which time during whose time by that time
have been; went had been; went am; had been come; had been
have been, left had been, left am, had left come, had left
would have been would be are be
went; had left had been; left have been; left have; had left
snowed, were was snowing, had been had been snowing, had been had snowed, were
pass to pass passed passing
have been; left had been; left am, had left come; had left
have gone have been going was going will have gone
must be in the U.S.A. for some time must have been in the U.S.A. for some time should have been in the U.S.A. for some time may be in the U.S.A. for some time
pass to pass passed passing
have gone have been going was going will have gone
I don’t agree Yes, that’s all right No, he can’t I think so
Being, to pass As he is, to pass He was, passing Having been, passing
come true; hard work come truly; hard work come true; hard works come truly; hard works
have been；left had been；left am；had left come；had left
pass to pass passed passing
works is working had been working will be working
Realizing To realize Realized Having been realized
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