while walking in the street ,you have to be very careful to

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while walking in the street ,you have to be very careful to
avoid__down by passing cars or trucks.a.to be knocked b.being knocked
答案为什么不是a?不应该是将来吗?虽然avoid+doing,可是前面还有while while 的主句不是要+done吗?
在什么时候while +done：doing+when?
都表示什么?
就像这道题while watching tv,___
a.the doorbell rang b.we heard the doorbell ring c.we heard
the doorbell rings d.we heard the doorbell rang
如果是B.C.D怎么分析?
为什么?

说的有些混乱哦.
首先回答你的第一个题,为什么不选a呢?没错,while 的主句是要+done,但是答案要是knocked,才符合.比如,make sth done这个结构,只能说 I made the car damished.而不说I made the car to be damished.或者I made the car be damished.
第二,选B.
首先排除a,因为a使整个句子没有主语.
剩下b,c d.记住hear sb/sth +doing...或是do原形.一般情况,动作发出者不是人而是物体时,用动词原形.
这里的选项中没有ranging,而且动作的发出者不是人,所以用原形ring.
不知道我的浅见对你有没有帮助.

while walking in the street ,you have to be very careful to you have to be very careful in this job,because a smal mista be careful while you are crossing the street（同义句） be careful 英语句子：I have told you over and over again to be careful while while crossing the street,you should be careful句型转换：while __ 连词成句street,to,you,across,the,are,walking,you,have,when,caref Be careful to look _____ways before you cross the street. A. Be careful to look both ways before you cross the street,（） be careful to look both sides of the street before you acros be careful to look both ways before you (cross)the street If there___on the street,you must be more careful to cross i 填空Be careful to look both ways before you cross the street.(