5.if（如果）或unless（除非）引导的条件状语从句,时态遵循“主将从现”的原则。
e.g. Even if you learn something well, you will forget it unless you useit.
The air pollution will be more terrible unless we take measures to deal with it.
6. some time; sometime;
some times; sometimes的辨析：(口诀：分开是一段，相连某时；分开s是倍次，相连s是有时)
(1) some time一段时间，做时间状语；
It takes sb. some time to do sth. 做某事花费某人多长时间。
(2) sometime adv.在（将来的）某个时候
e.g. I hope to visit the USA sometime in the future.
(3) some times意为“好几次，多次”；
e.g.Tom went to the Great Wall some times.
I have read the book some times.
(4) sometimes意为“有时”，为普通频率副词.
e.g.Sometimes my mother likes telling stories to relax herself.
Sometimes I go swimming every weekend.
7. (1)increase by增加了…...；
(2)increase to 增长到…
e.g. Traffic accidents have increased by three per cent in the past year.
The director hopes to be able to increase your pay to 6000 yuan a month.
8. 简单不定代词all, both,
none, either, neither, each，every的用法及区别：
(1)如若范围是两者，都选用both;选一者用either;都不选用neither；
e.g. Many people stand both sides of the street.
Trees are planted on either side of the street.
I don’t like neither of the two books.
(2)如若范围是三者或三者以上，都选用all,选一者用each或every;都不选用none；
e.g. None of teachers go to the school today.
Each of them is outgoing.
All toys are in the box.
(3)固定搭配:both…and… 两者都…；
either…or… 要么……要么……;
neither…nor…既不……也不……
e.g. Either you or Tom plays the role.
Neither Tom nor I am not students.
Both Tom and you are good students.
(4)简单不定代词可以与of连用；
e.g. None of students are in the classroom because today is Sunday.
Each of farmer there is friendly.
(5)each相当于形容词和名词的用法，但every只能用作形容词。
e.g.each apple = every apple = each
each of students
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