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

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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 others.而把be给漏掉``

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
这句话里的主干是：we urge to do sth.
其实就是urge 后面接动词不定式得结构（即to +动词原型的结构）,此句中,urge to 后面接了两个并列的短句wear...+ be ...,这里的be和wear一样是动词原型.因为polite是形容词,不能直接放在to的后面,前面必须接be动词,而这里的be动词不能是are,是因为动词不定式结构,to后面必须接动词原型,所以只能是be原型.

urge sb. to do sth.
urge the students to wear ....
urge the students to be...

and前后是两句话
前面是urge sb. to do 催促某人做某事
后面是词组 be polite to sb. 对某人有礼貌
这里用了and来联接,表示了两个意思

urge to do sth 句中polite是形容词做表语 前面要加be

上边几位回答都正确，我就不补充了

同意4楼的

urge to do sth是动宾结构,and要连接两个并列成分,所以后面也要用动宾结构,polite是形容词,为了让前后相同,所以用be做polite的系动词,让be引导动词句,和前面结构相同.

这一句可看作由两句组成的
We urge the students to wear their school uniform.
We urge the students to be polite to others.
后一句去掉共有部分We urge the students to, 就是be polite to others.
如果不加 be,就是
We urge the students to polite to others.当然是错的了

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?