请问 句子:I'm writing to every student who study in grade nine.有语法错误吗?

请问 句子:I'm writing to every student who study in grade nine.有语法错误吗?
请问 句子:I'm writing to every student who study in grade nine.有语法错误吗?

请问 句子:I'm writing to every student who study in grade nine.有语法错误吗?
有,STUDY 应该是 studies ( student 是单数）
另外,grade nine 应该是 Grade Nine
正确的是：I'm writing to every student who studies in Grade Nine.

studies
仅供参考，望能帮助到你，呵呵！

简洁点，
I'm writing to every student in grade nine.
这样就没有歧义了，反正看得懂。
如果非要坚持，我建议如下，但是感觉有点啰嗦。
I'm writing to every student studying in grade nine.
I'm writing to every student who studies in grade nine.