i have some question when i read one of your answer to another question.thank you and other people's answers.and i have some questions when i read one of your answer to another question.the place at which the bridge is supposed to be built should be

i have some question when i read one of your answer to another question.thank you and other people's answers.and i have some questions when i read one of your answer to another question.the place at which the bridge is supposed to be built should be
i have some question when i read one of your answer to another question.
thank you and other people's answers.and i have some questions when i read one of your answer to another question.
the place at which the bridge is supposed to be built should be where the cross-river traffic is the heaviest.再解释下为何要用which,where.
you said that if the clause is a full sentence,the reletive word can be where or at which ,certainly is in this case,and if the clause if not a completed sentence,what reletive word we should use?i cannot find it in the grammar book so would you like to explain it

i have some question when i read one of your answer to another question.thank you and other people's answers.and i have some questions when i read one of your answer to another question.the place at which the bridge is supposed to be built should be
i have some question when i read one of your answer to another question.
你的提问有两个错误：some questions,加s.answers,也加s
thank you and other people's answers.这句也有错误
thanks for yours and other people’s answers
the place at which the bridge is supposed to be built should be where the cross-river traffic is the heaviest.
翻译：架桥的地方应该是过河交通最繁忙的地方.
which是代前面的place这个名词.应该是at some place,固定搭配,用定语从句时at也要带上,所以用at which.
where是指代地点,前面虽然也是地点,但是有place做先行词.

前面那个是定语从句(Relative Clause或者Attributive Clause)，先行词是the place，在定语从句中作地点状语，即为：
the bridge is supposed to be built at the place,所以定语从句可以使用介词加上关系代词的方式来引导，这里换成where也是可以的。
下面那个where引导的是表语从句(Predicat...

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前面那个是定语从句(Relative Clause或者Attributive Clause)，先行词是the place，在定语从句中作地点状语，即为：
the bridge is supposed to be built at the place,所以定语从句可以使用介词加上关系代词的方式来引导，这里换成where也是可以的。
下面那个where引导的是表语从句(Predicative Clause),连接词是不可以用介词加上关系代词来替换的。所以只能使用where。这里表示“在...的地方”。
你另一个问题是要吧前面那个先行词加定语从句转换成其他的从句么？可以变成主语从句的。这时，句子就变成了Where the bridge is supposed to be built should be where the cross-river traffic is the heaviest.这时，前面那个where引导了一个主语从句，和后面那个表语从句都是名词性从句，这时，前面那个where就不可以用at which来替换了。
另外，你在提问的中，"reletive"应该是"relative"。

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