这里为什么要加be?We urge the students to wear their school uniform and be polite to others.这个句中的be是什么意思?为什么要加上去``如果是我可能直接写We urge the students to wear their school uniform and polite to other

这里为什么要加be?We urge the students to wear their school uniform and be polite to others.这个句中的be是什么意思?为什么要加上去``如果是我可能直接写We urge the students to wear their school uniform and polite to other 这个句子里为什么这里要加be?you're sure to be unhappy.为什么这里要加be? we are the same age这里为什么要加the We hurried to school .这里的hurried是作形容词,为什么不加be? 英语 这里划线句子must 后面为什么要加be He will be in his small boatYou and I will work in the same office都表示一般将来时,为什么一个加be,一个不加.这里be的区别是什么?那We'll be back at 5 o'colckback也是动词啊，为什么这里要加be 为什么要加beHe will be back by five .这里为什么要加BE?能不能不加BE呢?到底什么时候要加BE Simple present tense of the verb :to be这里to be 为什么要加to Everything Is Going to Be OK这里为什么要加be? 英语：would be like doing /像作某某事一样 这里为什么要加be 请问We should learn to be grateful,为什么要加to be? 请问 We just be informed from APL 中 JUST后面为什么要加BE we will be at home 为什么加be we have a new family joining us today,这里的join为什么要加ing? We hope our team wins 这里win为什么加S. All of these letters and telegrams,almost without exception,urge that the cause we have been fighting for___ A.be carried on B.being carried on C.carrying on D.to carry on 选哪个,为什么? We are less credulous than we used to be.这句话里面used后面为什么要加to be The first texbook ____ for teaching english as a foreign language came out in the 16th century.空处的答案是written,解析说因为texbook与written是被动关系,但是被动语态不是要在BE动词前面加BE的吗?这里为什么不用?