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that has been written that have been written which have been written which has been written
have; have has; has have; has has; have
have has have been has been
has joined…to has been joined… to has joined… with has been joined…with
have has have been has been
have been sent for has been sent for have been looked for has been looked for
that has been what have been which has been that have been
have been are has been has
happened; would not be has happened; would not be had happened; would not have been has happened; will not be
is； was had been； is was； has been has been； is
have been are has been Has
has has been have been had been
has left left
has been away from would leave
been；has been gone；has been g
had stayed is staying stayed has been staying
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