【#高二# 导语】高二本身的知识体系而言，它主要是对高一知识的深入和新知识模块的补充。以数学为例，除去不同学校教学进度的不同，我们会在高二接触到更为深入的函数，也将开始学习从未接触过的复数、圆锥曲线等题型。高二频道为你整理了《高二英语上学期复习知识点》希望对你有所帮助！
still, quiet
(1) still用作形容词，意为“静止的，不动的，平静的”。
keep (stay) still 保持不动
lie (stand) still 躺着(站着)不动
a still lake / evening
平静的湖/寂静的夜晚
用作副词，表示“还，仍旧”，可以修饰形容词、副词比较级。
be still busy 仍然很忙
win still greater success 取得更火成功
(2) still 侧重“一动不动”，quiet指“安静”，无动作，无声音，其反义词是noisy (吵闹的、喧哗的);
silent 指不出声，不说话。
对比：sit still 坐着不动
Be quiet, and the class will begin.
请安静，马上就要开始上课了。
Hearing the answer, he was silent for a minute ormore.
听了回答之后，他沉默了一两分钟。
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、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)
不定式做主语：
不定式做主语一般表示具体的某次动作。===动名词doing表示习惯的，经常的动作。
e.g: To finish the building in a month is difficult.
To do such things is foolish.
To see is to believe. (对等)
注:
1).不定式作主语时,谓语用单数
2).当主语较长，谓语较短时，常用it做形式主语，而将不定式放到谓语的后面。
it做形式主语，不定式放在谓语动词之后常用于下列结构中：
(1)It is/was +adj.+of sb. to do…
(2) It is +adj.+for sb.+to do…
It is easy / difficult / hard / foolish / unwise / right / wrong / unnecessary
(3) it is +a +名词+ to do…
It is a pity / a pleasure / a pleasant thing / one’s duty / an honor / a shame / a crime / no easy job… to do
It takes (sb.) some time / courage / patience …to do…
It requires courage / patience / hard work… to do…
注意: probable和possible均可作表语，但possible可以用不定式作真实主语，而probable不能用不定式作真实主语。
It is probable for him to come to the meeting.(错)
It is possible for him to come to the meeting.
It is possible / probable that he will come to the meeting.
不定代词的用法
不是指明代替任何特定名词的代词叫不定代词。
常见的不定代词有 all, both, each, every, some, any, many, much, (a)few, (a)little, one, ones, either, neither, other, another, no, none 以 及含有 some-, any-, no-等的合成代词(如：anybody, something, no one) 。
这些不定代词大多 可以代替名词，在句子中作主语、宾语、表语或定语。但 none 和由 some, any, no, every 构 成的复合不定代词(如 somebody 等)只能作主语、 宾语和表语。 every 和 no 只能作定语。
不定代词可作主语。当作主语时，要明确这一不定代词究竟是单数还是复数，以确定它和 谓语动词在人和数的一致。
不定代词还可作定语。当作定语时，应该注意其所修饰的名词是可数还是不可数，以确定 这个名词用单数还是复数。
例: Much has been done to fight pollution;each of them has got a present.
many, few 和 both 用于可数名词，表示复数概念。
All, both 和 each 和含有 every 的复合代词用在否定句中只表示部分否定。
例：Not all the students have been to the Austrlia. She can’t work out both of the difficult problems. Everybody cannot work out the problem.
Neither,none 和含有 no 的复合代词表示全部否定。
例: None of us can answer the question. Neither of the questions is right.
