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is has been have been are
open, has closed close, has been open open, has been opened closed, has been closed
was had been has been were
went has been has gone have been
is has been have been are being
has come out came out went out goes out
It has There has We have There is
went to has gone to has been to has been in
some time sometime sometimes some times
has been going was going went to be has gone
has it been since ; for which is it before ; in which it is when ; that it is since ; for which
Is , begin has been , began has, been had been ,began
has been；since had been；until was；after would be；before
has been going went goes has gone
It has There has We have There is
have gone，since then goes，from then has gone，since then went，ever since
has not heard of had not heard of has not been heard of had not been heard of
is; come is; have come has been; came has been; have come
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