存在can be/must be ,can’t be 而没有mustn't be

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• 麻烦大家帮忙填以下括号里的词或词组,1．That is a seventeety-century book so ( ) that I can’t even remember the name of it.2.When a soldier receives orders he must obey them ( )without question.3.I like this dress ( ) although the others are very nice too.4.John is a trusty assistant,and you can take him into your ( ) anytime.5.I’m afraid you have to work weekends to ( ) the lost time.
• 单选： 1.-What do you want to be when you grow up? -____teacher like you. a.The b.An c.A d./2.-Will you please answer the door? It____be your sistor.-Sorry, I____. I'm feeding the rabbit.a.must;mustn't b.may;can'tc.shall; will d.must; needn't
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• can't cannot用法Cannot是“不可以”,而can not是“可以不”.举个例子：I cannot believe this!（我无法相信!等于I can\'t believe this!） I can not believe this!（我可以不相信!也就是说,I can believe this,or I can not believe this.我并不一定要相信,我可以选择不相信.）人家说是这样用行吗?有些人说can't cannot是一样的?究竟谁对啊?还是两个都错
• Our teacher must be in his office,A mustn't he B can't he C isn't he D must
• 英语中的反意疑问句 直接间接引语 定语从句 宾语从句这些复杂的复合句能否给我讲解一下 尤其是变式 时态和结构