1. 时间前的at/in/on
- 具体到某天用on
- On January 25th
- On January 25, 2010
- 具体到年或者月用In
- In 2010
- In January
- In January 2010
- 具体到几点用at
- I get up at six in the morning.
- In January 2010, 25th, at 6:00 a.m
- 一些固定搭配
- in the morning/afternoon/evening
- at noon/night
- on the weekend
- on school days 在上学日
- late at night 在深夜
2. assure 和 ensure 的区别
- I want to assure you that nothing will go wrong tomorrow．
我想向你保证，明天不会出错。assure是“向某人保证”(make someone confident)的意思 - I want to ensure that nothing will go wrong tomorrow．
我想确保明天不会出错。ensure是“确定”(make certain)的意思
3. might 和 may
- may 可以放在句首也可以放在句中
- 而might 要放在句中不能放在句首
- might 在虚拟语气时用的较多
- 再有就是 might 在作为 may 的过去试时候用
