commit onself to sth

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• 用be supposed to do sth句型造十个句子
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• 这个是我所学过的短语,肯定句decide to do sth ,否定句decide not do do sth We decided to do to see a moive this sunday.（改为否定句）We ( )( ) to do to see a moive this sunday.请说明原因,
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• He found ___ very difficult to drive a car.A.him B.it is C.it D.thatHe found ___ very difficult to drive a car.A.him B.it is C.it D.that答案给的是C,但我想知道这里为什么不是用“it is + adj.+ to do sth.”句型呢?还有it在这里是不是做宾语从句的形式主语?
• I will spend the whole night_____in my room,preparing for the exam.I will spend the whole night ____ in my room,preparing for the exam.A.locked B.in locking C.lockingD.being locked这个题给的参考答案是A，我觉得D是不太好spend time in doing sth.但这个句型只能用在花时间做某事上其中某事与主语应为主动关系 而本句显然不是我花一晚上的时间锁我自己的意思 所以不能用这个句型 排除B 再来看 ing表进行而ed形式表状态 我被锁在房间里是一种状态所以排除C 选A 请问选A之后这个句子怎么分析结构呢？locked in my room在此句中做什么成分呢
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