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

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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.

1.avid+doing 防止被撞，跟WHILE无关。being done 也有将来时的意思。
2.hear 属于一类感官动词，后跟不带TO的动词原形。

While I was walking in the street,I met Liu Dehua.转化为I met Liu Dehua while I was walking in the street.while换when, in the street,a terrible car accident happened,resulting in three deaths. A While walking B Walk C Walking D When I was walking walking in the sun walking in the walking in the sun Walking In The walking in the I happened_(meet)one of my old friends while I was walking in the street I saw an accideng_____i was walking in the street.------中选 while before after until While John was walking to school ,he saw a cat in the tree 对in the tree 提问 while walking in the garden,he hurt his leg.这句话可不可以说成：while having walked in the garden,he hurt his leg.为什么? While I was walking in the street,I met Liu Dehua.可不可以转化为I was walking in the street,while I met Liu Dehua.后半句中应用while还是when?转化为I was walking in the street while I met Liu Dehua. While I was walking down the street,I saw a cat in the tree 改为同义句 walking in the sun歌词 walking in the sky歌词 WALKING IN THE LIGHT 歌词 Walking in the Sky 歌词 Walking In the Park 歌词