lot/lots of
lots of和a lot of都表示很多，可用于可数名词和不可数名词之前。
a lot意为经常、非常，作为副词使用。常常放在句子末尾，不能用于名词之前。一般不用于书面语。
通俗：diana likes her apartment a lot.
正式：diana likes her apartment very much.
通俗：there are lots of books in our library.
正式：there are many books in our library.
2. among/between：
两人以上用among，两人用between。
通俗：discussions between our group members were often verylively.
正式：discussions among our group members were often very lively.
3. around/ about
around不能用在时间、距离等数量上。
通俗：the class usually begins around nine.
正式：the class usually begins at about nine.
4. badly
不能用“badly”代替“very much”。
通俗：the team wanted to win really badly.
正式：the team wanted desperately to win.
5. based off of
based off of是based on的同义词，但是更加口语化。
通俗：based off of that information, we can move ahead with theplan.
正式：based on that information, we can move ahead with the plan.
6. because
reason”后面不可以接“because”。
通俗：the reason for our flight delay is because of bad weather.
正式：the reason for our flight delay is the bad weather.
7. a bunch/bunches
bunch和bunches只能用在有限范围内的或长在一起的。东西上，比如香蕉和葡萄，对其他可数名词不适用。
通俗：a bunch of us are going to the movies tonight.
正式：a group of us are going to the movies tonight.
正式：there are three bunches of bananas on the counter.
8. each other/one other
两个用each other,两个以上用one another。
通俗：everyone at the party wished each other a happy new year.
正式：everyone at the party wished one another a happy new year.
正式：my sister and i wished each other a happy new year.
9. guys
不用于书面语、正式使用场景。
通俗：i hope you guys can join me at the restaurant.
正式：i hope all of you can join me at the restaurant.
10. in / into
in"强调“在……中”的状态，"inside"强调从外到里的动作。
通俗：bill went in the bus station to buy a ticket.
正式：bill went into the bus station to buy a ticket.
11. infer/imply
infer”指思考这一行为，“imply”指“说某事”的行为。
错误：i saw your memo about a noon meeting. are you inferringthat we should h**e lunch together?
正确：i saw your memo about a noon meeting. are you implyingthat we should h**e lunch together?
12. it's/its
不许手滑！错误：the committee has reached it's goals this year.
正确：the committee has reached its goals this year.
13. kind of / sort of
当在正式文章想表达"very" ,rather" ,somewhat"时，不可以用"kind of"和"sort of"。
通俗：jim was sort of angry when he learned we went to the parkwithout him.
正式：jim was somewhat upset when he learned we went to the parkwithout him.
14. less than/fewer than
less than只用于描述不可数名词。
通俗：there are less people in the store today than yesterday.
正式：there are fewer people in the store today than yesterday.
15. like / as
比较行为动作用“as”；比较东西时用“like”。
通俗：alan wants to write a new essay, just like sarah does.
正式：alan wants to write a new essay just as sarah does.
16. like / maybe
想说“like”“maybe”时，用"approximately", perhaps"和"about"代替。
通俗：there were like thirty people at my birthday party.
formal: there were approximately thirty people at my birthdayparty.
17. meantime
通俗：meantime, the rain continued to pour.
正式：in the meantime, the rain continued to pour.
正式：meanwhile, the rain continued to pour.
18. on account of
通俗：on the account of the weather, our plane was late.
正式：because of the weather, our plane was late.
19. plenty
通俗：it has been plenty warm all week.
正式：it has been very warm all week.
20. so
不能把“so”当做“therefore”的同义词。
通俗：dmitry knew that i missed class, so he shared his notes.
正式：dmitry knew that i missed class; therefore, he shared hisnotes.
通俗：this week's homework is so difficult.
正式：this week's homework is very difficult.
21. they're/their/there
错误：do you know if their going to the party?
正确：do you know if they're going to the party?
错误：what is there address?
正确：what is their address?
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