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had been; have seen w。w。w.k。s。5。u.c。o。m have been; have seen had been; had seen w。w。w.k。s。5。u.c。o。m have been; had seen
have raised have been raised have been risen have risen
had been were have been has been
since the last century for a very long time since a few hundred years ago since a few years ago
has been built have been built were built have built
have had have been were has been
were；were have been；have been have been；were were；have been
have been;have been have been;were were;have been were;were
board broad aboard abroad
were have been has been was
have been were had been are
were have been has been was
have had have have been has been
have produced have been produced are producing are being produced
are going had been went have been
has been built have built were built have been built
Have you been Have you gone Did you go Will you go
The number of; has been planted A great number of; have been planted A.great number of; has been planted A.great number of; have planted
were have been had been are
board broad aboard Abroad
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