"She must be at least forty ."为什么要在must前加be?must后加be

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• 为什么下面的这样句子中都要加be? 1.He is going to be sick. 2.She can't be out. 3.You must be quiet.
• make a good use of 后加doing 还是to do?能造句句子吗?我有一点很不懂就是every minute must be made full use of to study english为什么不是studing呢?这句句子应该是对的要这么看every minute must be made full use of/to study english但是我就是不知道为什么用studing不行呢?好象读上去也通..
• she must be looking for a new job请问这句话的意思是找到工作了还是正在找呢?情态动词后面应该跟动词原形 为什么look要加ing呢?
• she must go to the baker`s to get some cakes.其中get前面为什么要加to
• The movie Lost in Thailand enjoyed ___ instand success in China,bringing in a large profit to ___ cinema.A.an; /     B./; a     C.an; the     D./; the就请解析一下为什么后一空就是“cinema”之前要加the吧~ ___ twice a year,whether it is a car or a truck,is the rule that every driver must obey in this city.A.Examining     B.Being examined     C.Examined     D.Having been examined      
• 有3道英语选择题.1.If you plant watermelon seeds in the spring ,you( )fresh watermelon in the fall.A.eat B.would eat C.have eaten D.will be eating为什么不能选B啊?是不是后面不能用would那种的?2.For many years,people( )electric cars .However,making them has been more difficult than predicted.A.had dreamed of B.have dreamed ofC.dreamed of D.dream of这题为什么不选C啊?为什么一定要在前面加一个have?3.The traffic rule says young children under the age of four and ( )less than 40pounds must be in a child s
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