英语~~The box is too heavy to lift.lift后面加it麽?

The box is too heavy for___ to lift the box is too heavy for me to A carry it away B lift it up The box is very heavy .He can't lift it.用too to so that not It is too heavy for me to lift the box.先怎么改成同义句? 句子分析：The box is too heavy for me to lift. The big box is too heavy for me to carry,后面为什么不加it the box is too heavy to carry后面要不要加it 求分析语法成分最好细致一点 box is too heavy for me to lift. The box was too heavy for them to lift.(保持句意) this box is so heavy that no one lift it. It is impossible for a child to lift such a heavy box.这句话中fo 10.The box is ________ heavy ________ I can’t lift it.