The Five-Ring Road is to be open to traffic before Nitional

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The Five-Ring Road is to be open to traffic before Nitional Day语法求解
to be open to traffic为什么不可以用：to open traffic?

这里的to be open并不是被动,而是表示一种将要发生的行为,open在这里不是动词而是形容词.去掉to be语法上没有错误,只是表达的意思会有不同.英语中to be的用法很常见,有时候可以去掉.其实be to be就是be to do的变形,只不过do换成了be,一个是行为动词,一个是Be动词.
比如：
My dream is to be a doctor.我的梦想是成为一名医生.
Thanksgiving is to be happy 感恩就是幸福.
再问：有人说五环路本身不具备行为能力，to be open 表达了是 “被”开放，是由管理者决定的。这好像也合理也？
再答：如果是那样的话，那么open就要加ed，这里没加，很明显是形容词。
再问：哦，还有为什么open后面还要加to，不加行吗？
再答：当然要加to，这个是形容词很常见的用法，be+adj+to do，总不能直接加动词吧，副词才可以，形容词是不可以的。比如： I am very happy to see you. it's wonderful to play with you on the beach. 这些都是很常见的句子，这个to是不定式，是跟后面要接的动词连在一起的。

The Five-Ring Road is to be open to traffic before Nitional The Highway Bridege ,a() bridge ,is already open to traffic. The road ___ to traffic next week. Road to the traffic接什么? 英语翻译1.One part of the ring is open to the water2.There is a the bridge ＿ [ be] open to traffic in a few months The sutong bridge_____(be) open to traffic in a few years,wo if the traffic light is red,you can't go____ to road The Sutong Highway Bridge,a( ),is already open to traffic.a, Because of the accident,the road was close to traffic. The road is poor enough to be worth_____.填什么 I think () () to obey traffic rules when () on the road.