1.与不可数名词或复数可数名词连用,在否定和疑问句中,常把some换成any,但是,如果语聊会得到肯定回答的疑问句中仍用some,
eg:1.Would u like some milk in your coffee?
2.Didn't u borrow some books of mine?
你的比如是对的,我们老师当时讲的是请求的时候用some
2.不迟于,在...之前；在...期间
不一定啊,不过by1990一般是直到1990
by the end of world war II,by有在...期间的意思,当然可以与during the world warII相同了
3off此时是副词,解释为“（在时间或空间上）距,离”
The results are still a long way off解决办法尚需时日
有some way off 的用法