canmay must表猜测时的区别

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• canmay must表猜测时的区别
• must表推测时的用法?
• 在表推测时must may could might的区别和can not、could not、may not、might not的区别
• Where is Jack?I can't find him anywhere.he___his homework upstairs.A must have done B must be doing我知道这里应该选择must be doing 理解为他正在楼上做作业.可是为什么不能选择must have done呢?这里不是问JACK在哪里吗?那应该表猜i测阿.must have done 不就是表猜测的嘛.如果不是的话,在哪种情况下用must have done 比较合适?
• 关于连词for与because,as,as a result等的区别rt,最好有例句.我问的是for表原因时与becasue等的区别如：it must have rained last night,for the ground is wet.这里不能用because
• ---How is that,Joan?---Yeah,it's from the boss.She ( ) first whether she likes it.A．shall go B.ought to have gone C.should go D.must have go 请讲详细点选哪个还有为什么不能选CAC应该都可以表“应该”嘛但麻烦讲一下为什么不选其他的，THANKS!还有could have done和might have done都有本可以做而没做成的意思，那么二者有什么区别呢？比如这个题---John saw a three-year-old cjild walking alone in a sjopping mall,so he took the child home immediately and called the police.---But he_____have waited withthe child until the parents returned.A.sh
• have to be 和 must be 表推测时的区别
• It's nearly seven o'clock.Jack_______be here at any moment(随时).A.must B.need C.should 我仔细浏览过回答过这道题的留言,觉得解释的都不够好,所以我尝试做出更加合理的解释,希望会对再碰到这题的网友们一点帮助!本题是1995年英语高考真题第31小题.该题选择C.should 不选can的原因是：Can表示推测时,译为“可能”,多用于否定句,一般不用肯定句；但是can表示一时常有的行为和情形,也可用于肯定句,译为“有时会,时而可能”；Should表可能性、推论、推测、期待等,译为“按理该；估计”；need没有表示推测的用法,need作情态动词时不用于肯定句,但是作实义动词时不受该限制；must表推测时语气最肯定,只用于肯定句,译为“一定”.
• 反义疑问句中讲“含有think,believe,suppose,imagine,expect等动词后接宾语从句构成的主从复合句其中有一句：如果主句的时态是过去时等等,疑问句应和主句的人称时态保持一致.如果主语是第一人称呢?能给一个例子么?另外must表猜测时，反义疑问句用must后面那个动词开头，那么can't表猜测时，反义疑问句是否也用can't后面那个动词开头呢？
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• 用can、may、must造句,并变否,变疑,肯、否回答
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