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have been; left had been; left am; had left come; had left
had been was have been have gone
have been; went had been; went am; had been come; had been
have been, left had been, left am, had left come, had left
have been；left had been；left am；had left come；had left
went; had left had been; left have been; left have; had left
some time sometime sometimes some times
has offered had been offered have been offered is offered
some time sometime sometimes some times
have been; left had been; left am, had left come; had left
has been；since had been；until was；after would be；before
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
have been; left had been; left am; had left come; had left
was; since had been; since would be; before was; before
has been ； since had been ； until was； after would be ； before
was offered have been offered had been offered is offered
has offered had been offered have been offered is offered
have been；left had been；left am；had left come；had left
have been; left had been; left am; had left come; had left
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