Mary is closing the door.改为否定句

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Maryisclosingthedoor.改为否定句Maryisclosingthedoor.改为否定句Maryisclosingthedoor.改为否定句is就是助动词,直接在其后面加not构成否定

Mary is closing the door.改为否定句
Mary is closing the door.改为否定句

Mary is closing the door.改为否定句
is 就是助动词,直接在其后面加not构成否定句.
Mary isn't/is not closing the door.

否定句
Mary is not closing the door

Mary is not closing the door、Mary is opening the door