[understanding every sentence is enough. ]
That's certainly OK.
But it is much more difficult than understanding grammar, especially for a China-born Chinese student who regards English as a foreign language, I am afraid~~
建议楼主:搞本语法书,结合书上的例句,理解每一个语法项目。
相信我,弄懂语法并不难,起码远比培养什么“语感”要容易得多。