将此句变为被动语态,每空一词.I saw them play football on the playground .They ------ -------- --将此句变为被动语态,每空一词.I saw them play football on the playground .They ------ -------- ------- ------- football on the play

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将此句变为被动语态,每空一词.Isawthemplayfootballontheplayground.They----------------将此句变为被动语态,每空一词.Isawthemplayfo

将此句变为被动语态,每空一词.I saw them play football on the playground .They ------ -------- --将此句变为被动语态,每空一词.I saw them play football on the playground .They ------ -------- ------- ------- football on the play
将此句变为被动语态,每空一词.I saw them play football on the playground .They ------ -------- --
将此句变为被动语态,每空一词.
I saw them play football on the playground .
They ------ -------- ------- ------- football on the playground

将此句变为被动语态,每空一词.I saw them play football on the playground .They ------ -------- --将此句变为被动语态,每空一词.I saw them play football on the playground .They ------ -------- ------- ------- football on the play
They were seen to play football on the playground
主语+谓语动词+动词被动语态+to do sth