* that 作引导词且充当宾语时，可省略
* 区分限制性~与非限制性~
*
* 固定搭配 引导
* the same ... as
* 像 ... 一样的
* the same .. that
* 正是 ...
* as 和 which
* as 位置灵活，后跟 be 动词
* which 只能放在所修饰的词/句后，后跟任何动词
* 先行词是人，that 和 who
* 用 who
* 非限制性定语
* 定语从句与指人先行词被隔开
* 先行词为 people 和 those、one、ones、anyone、everyone、none、
all（指人）
* 关系代词作主语
* There be 句型多用
* 用 that
* 先行词前由形容词最高级或序数词修饰
* 先行词前由only、some、any、no、every、little、few、much、all 和 very等
* that 和 which【仅作了解】
* 介词+关系代词 作引导【仅作了解】
* 寻找先行词 - 定语从句的先行词有可能不是离他最近的名词（短语）
* 引导词前面
* 离他最近的名词（短语）【最常见】
* 并列的成分
* 整个从句
* 先行词与引导词被隔开
* As a linguist, he acknowledges that all varieties of human language, including non-standard ones like Black English, can be powerfully expressive — there exists no language or dialect in the world that cannot convey complex ideas.
* 绝大部分情况
找定语
* 名词（短语）后
* 定语
* 谓语
* 插入语
* 状语
* 先排除后确认
翻译
* 大定语内包含多个小定语
* 从后往前翻译
状语从句
引导词 + 状语从句 + “，” +主句
主句 + 引导词 + 状语从句
引导词
* 时间
*
* when 的特殊用法
*
* when, while 和 as 的区别
*
* until 和 not ... until 的区别
*
* no sooner ... than 和 hardly ... when 的用法
*
* 地点
* 常用：where
* 地点状语从句与定语从句
* 区别
*
* 转换
* 状语从句前加“in/at/from the + 地点”变定语从句
* 特殊：wherever，anywhere，everywhere ...
* 原因
* 常用：because，since，as，for ...
* 特殊：seeing that，now that，in that，considering that，given that ...
* 例外：because of，due to（句末），owing to（句首），thanks to，for the sake of，as a result of ... 【后只能跟名词（短语）或动名词】
* 目的
* 常用：so that，in order that ...
* 常见动词不定式表目的：to，in order to，so as to（不能置于句首）...
后跟动词原形
* 结果
* 常用：so that，so ... that，such ... that ...
* 区别
*
* 用法
*
* 特殊：to the degree that，to the extent that，to such a degree that ...
* 条件
* 常用：if，unless（表if not）...
* 特殊：as/so long as，only if，providing/provided that，supposing（that），in case that，on condition that ...
* 让步
* 常用：though，although，even if，even though ...
* 特殊：as，while，no matter ... ，in spite of the fact that，whatever，whoever，whenever，wherever，however，whichever ...
* 作文锦上添花常用 although 在句后拉长句子
* 方式
* 常用：as，as if，as though ...
* 特殊：the way ...
* 例外（介词短语）：by，through，in ... way，in ... manner ...
* 比较
* 常用：as，than
* 特殊：the more ... the more ...，more than，more ... than ...，not so much ... as ...
If you are a tear in my eyes, I will never shed it. If you were a tear in my eyes, I would never shed it.
If I was a dog last night, I could sleep beside you. If I had been a dog last night, I could have slept beside you.
此处动词过去式不表示过去时而是描述现在没发生但希望发生的事（主观想象的假设）
对现在和将来的虚拟
主句 would + do ， 从句 一般过去时
对过去的虚拟
主句 could + have done ， 从句 过去完成时
* am / is / are - were 不用 was
* would = could = might = should
特殊用法
以下情况用 should + 动词原形 表虚拟，should可以省略
以防：in case that , for fear that , lest ...
命令：order , direct , command ...
建议：suggest , advise , propose ...
要求：ask , request , require , demand ...
用虚拟
必要/紧急：It is necessary / important / urgent that ...
以下情况区别对待（将本来的时态变为相应的过去时）
wish、if only，but for，or / otherwise，as if / as though ...
对现在的虚拟 - 现在过去时
对将来的虚拟 - 将来过去时
对过去的虚拟 - 过去完成时
would rather
would rather do sth - 宁愿做某事（非虚拟）
would rather sb did - 宁愿让别人做某事（对现在虚拟）
It is high time（that） - 后用过去式表虚拟，意指赶紧做某事
（部分）倒装
普通句子变一般疑问句 / 助动词或 be 动词放在主语前
具体用法
否定词放在句首
so（表肯定），nor/neither（表否定）位句首，承前句子
含 so ... that ... 结构的句子，so 引导的部分置于句首用倒装，that 引导从句不做修改
only + 状语 放在句首
as 引导让步状语从句
形容词 / 副词 / 分词 / 名词 + as + 状语从句
* 形容词句首
* Ugly as I look，I am tender.
* Simple as the drawing seems，the meaning behind it is far-reaching.
* 副词句首
* Happily as we stay together , I would not like to see him again.
* Much as I love my mother , I cannot agree with her.
* 名词句首（前面不能加冠词）
* Old man as he is , I cannot forgive his bad behavior
省略 if 的虚拟语气
If you were a tear in my eye , I would never shed it. Were you a tear in my eye , I would never shed it.
If I had been a dog last night , I could have slept beside you. Had I been a dog last night , I could have slept beside you.
