这个句子中没有be动词、情态动词，只有实义动词，因为主语是第三人称单数，所以要用助动词does。
改为否定句:He doesn't put the tree in the room.
改为一般疑问句:Does he put the tree in the room？
望采纳！！！
否定句：He doesn't put the tree in the room.
一般疑问句：Does he put the tree in the room?
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