1. which is grammatically correct?
① it seems that they are happy.
= they seems to be happy.
② it seems that the box is heavy.
= the box seems to have been heavy.
③ it seemed that she had been happy
= she seemed to have been happy.
④ it seems that i lost my key.
= i seemed to lost my key.
⑤ it seems that american football is a popular game.
= american football seem to be a popular game.

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