说明作文中语法结构以及找出作文中短语词组说明用法

It is obvious that many students are shirt-sighted 主语从句,你打错了一个地方short-sighted,是o不是i
it’s necessary for us to do something to draw attention to the protection of our eyesight “it”做形式主语,真正的主语是后面的不定式to do something ,而to draw attention to the protection of our eyesight是不定式做目的状语,注意 to the protection 的to是介词
First,relax our eyes after reading for a long time,祈使句以及介词后的动名词
when reading something省we are的伴随状语
we should make sure we are in the perfect light 宾语从句
which can do good to our eyes非限定性定语从句
Whenever we are free 时间状语从句
we can do a set of eyesight-protection exercises so that our tired eyes can be restored quickly.so that引导的目的状语从句
Finally,I advise that everyone should have enough sleep建议类宾语从句的虚拟语气
I believe it is good for protecting our eyesight 宾语从句
短语如下：
draw attention to .../for a long time/for example/ At the same time/make sure /neither...nor.../do good to.../a set of .../keep fit/be good fo