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1、at
如：常用词组有： at noon, at night
表示时间的 at, in, on：表示片刻的时间，at 8 o’clock，at midnight, at the end of, at that time, at the beginning of, at the age of, at Christmas, at New Year 等。
in 表示一段的时间
如：in the morning, in the afternoon, in the evening, in October, in 1998, in summer, in the past, in the future 等。
on 总是跟日子有关，on Monday, on Christmas morning, on the following, on May Day, on a warm morning 等。
2、表示时间的 since 和 from：since 表示从过去到现在的一段时间的过程，常与现在完成时连用：from 表示从时间的某一点开始，不涉及与现在的关系。一般多与现在时、过去时、将来时连用。
如：I hope to do morning exercises from today./ We have not seen each other since 1995.
3、表示时间的 in 和 after：两者都表示“在(某个时间)之后，区别在于in表示“在(一段时间)之后” ，而 after 则表示“在(某一具体时间点之后)，in 短语和将来时态连用，after 短语和过去时态或将来时态连用。
如：We’ll be back in three days.
After seven the rain began to fall.
What shall we do after graduation?
After two months he returned. 注意：after 有时也可以表示在一段时间之后(常用在过去时里)
表示时间的介词
(1) in表示“在某一时间段”或“在某一时候”，如用在月、季、年份、时代、世纪等时间名词的前面，或用来泛指一天的某一段时间。in也可以指“在……之后”，表示从说话起的若干时间内。
如： in July/summer/20xx/ancient times
The bus will be here in ten minutes.
(2) on表示“在特定的某一天”，也可用于带有修饰语的.一天的某个时间段之前。如：on Saturday, on Saturday morning, on the morning of August 1st
(3) at表示“在某一时间点”，或用来表示不确定的时间和短期的假日、时节等。
如：at six o'clock, at Easter
(4) over, through (out)两者均指“经过的全部时间”。
如：Stay over the Christmas.
(5) for与since：for表示动作或状态延续的全部时间长度，为“长达……”之意;since用于指从过去特定的某个时刻到说话时为止的一段时间;含有since时间短语的句子要用完成时，但含有for时间短语的句子不一定要用完成时。
用it 作形式主语的结构
(1) It is ＋ 名词 ＋ 从句
It is a fact that ? 事实是?
It is an honor that ?非常荣幸
It is common knowledge that ?是常识
(2) It is ＋ 形容词 ＋ 从句
It is natural that?很自然?
It is strange that?奇怪的是?
(3) It is ＋ 不及物动词 ＋ 从句
It seems that? 似乎?
It happened that? 碰巧?
It appears that? 似乎?
(4) It ＋ 过去分词 ＋ 从句
It is reported that? 据报道?
It has been proved that?已证实?
It is said that? 据说?
1. Instead of spending your vacation on a bus, … you may want to try hiking. Instead和instead 0f的用法
2. Say "Hi" / "Hello" / "Thanks" to sb. (for me) 问候的句型
3. Is anybody seeing you off? 进行时表将来
4. She struggled and struggled, and could not get on her feet. (= keep struggling)
5. You should not go rafting unless you know… unless引导条件状语从句，相当于if… not
6. By staying at…, tourists can help the villagers make money so that they can take care of the fiver and the birds. 目的状语从句
7. She was so surprised that she couldn't move. 结果状语从句
8. Tree after tree went down, cut down by water. 过去分词作状语
9. The next moment, the first wave swept her down, swallowing the garden. 现在分词作状语
10. However, before she could think twice, the water was upon her. It didn't take long before the building was destroyed. before的用法
过分词用在get,have,make, 的后面。
1.注意“have +宾语+过去分词”的两种情况：
A)表"让某人做某事/让某事(被人)做"
eg: I have had my bike repaired.
The villagers had many trees planted just then.
B)表"遭遇到某种不幸，受到打击/受….影响，蒙受….. 损失"
Eg:I had my wallet stolen on a bus last month.
The old man had his leg broken in the accident.
He had his leg broken in the match yesterday.(MET1986)
2."make+宾语+过去分词",在这种结构中，过去分词的动词必须是表示结果含义的。如：
They managed to make themselves understood in very simple English.
I raised my voice to make myself heard.
