Let him open the door.（改成否定句

Let him open the door.（改成否定句 Let the window closed,keep the door open否定句 将Please open the door改成否定句如何改 Let 型祈使句的否定形式能不能是这样的：Don't let him open the door. Open the door该成否定句 open the door (改否定句) plese open the door改为否定句 Open the door,please.(改为否定句) 判断对错：1.Not open the door.是祈使句否定句.2.Let's sing and dance.是祈使句 按要求改句子.1.Please open the door.(改成否定句) 2.Sandy goes walking e open the door 否定旬 could you please open the door?改为否定句