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isn’t feeling hasn’t been feeling hadn’t been feeling wasn’t feeling
might be may have been should have been could be
there is no life there now there is a large amount of water at the poles the Mars may be able to support life in the future conditions may have been similar to those on the Earth
prepared is prepared has been preparing is preparing
to help to helping to help helping
explored is exploring has been exploring has explored
has gone to has been to has gone has been
some time sometime sometimes some times
explored is exploring has been exploring had explored
has died die has dead has been dead
some time sometime sometimes some times
explored is exploring has been exploring has explored
there is no life there now there is a large amount of water at the poles the Mars may be able to support life in the future conditions may have been similar to those on the Earth
has been；since had been；until was；after would be；before
isn't feeling hasn' t been feeling hadn't been feeling wasn't feeling
has been ； since had been ； until was； after would be ； before
cleaning to clean being cleaned cleaned
have been sent has been sent was sent were sent
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