有语法错误吗?

Last week,we did a survey among the students in Green High School.We asked them how they got to school.

1 学生中的调查应该用"among"
2 宾语从句后应该要用陈述句语气
3 主从时态要一致
4 students是格林中学的应该是特制,所以不能漏掉the

上周我们对格林高中的同学做了一次调查。我们询问他们怎么样去学校。

正确译法：
Last week we did a survey upon students in Green High School. We asked them how they get to school.

这样改一下是不是更好：
Last week,we did a survey of （the） students (in) Green High School.We asked them how they (go to) school.

Last week,we did a survey ”among“ students at Green High School.We asked them how they "got" to school.应该用GOT，过去时
a surver of students是指关于学生的调查，而事实上是在学生中调查!

有错误，但是因为句子本身是过去式，就要前后一致，用did而不是用do
应该改成:We asked them how did they get to school.

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