三.【语法详解】
used to, be used to, so…that, such…that
㈠used to, be used to的用法
⒈used to＋动词原形，过去常做某事；否定式为used not to do sth或did not use to do sth；疑问式为Did…use to do sth?或Used… to do sth? There be与used to的用法为：肯定式There used to be….；否定式There used not to be…或There did not use to be…；疑问式Used there to be…? e.g.
⑴She used to live on her own.否定式：①She used not to live on her own. ②She didn’t use to live on her own. 疑问式：①Did she use to live on her own? ②Used she to live on her own?
⑵There used to be a clock tower. 否定式：①There didn’t use to be a clock tower. ②There used not be a clock tower. 疑问式：①Did there use to be a clock tower? ②Used there to be a clock tower?
⒉be used to sth习惯某事，be used to doing sth习惯做某事，也可以表达为get/become used to sth, get/become used to doing sth。e.g. ①Daniel is/gets/becomes used to the life in the city. ②She is/gets/become used to getting up early.
㈡so…that, such…that的用法
⒈so, such的用法：
⑴so是副词，修饰形容词或副词原级；such是形容词，修饰名词或名词短语。
⑵such修饰含有名词单数、名词复数和不可数名词的名词短语，即：①such a/an＋形容词＋名词单数 ②such＋形容词＋名词复数 ③such＋形容词＋不可数名词。
注意以下特殊情况：such修饰名词单数时可以转换为so，但是词序不同，即：such a/an＋形容词＋名词单数＝so＋形容词＋a/an＋名词单数。当名词前有many, much, few, little这四个词修饰，只能用so，即so many/few＋名词复数，so much/little＋不可数名词；简言之，so修饰“两多”、“两少”。例如：
①such a man ②such an exciting film＝so exciting a film ③such exciting films不能说成so exciting films ④such fine weather不能说成so fine weather ⑤so many/few books不能说成such many/few books ⑥so much/little pollution不能说成such much/little pollution。
⒉so…that…, such…that…如此…以至于…，引导结果状语从句，两者在意思上可以互换。such修饰名词或名词短语；so修饰形容词或副词原级。当so前面的动词是连系动词时，so后面用形容词原级；当so前面是行为动词时，so后面用副词原级；即：连系动词＋so＋形容词原级，行为动词＋so＋副词原级。so或such的使用是中考的一个重要考点。
⑴The problem is so difficult that we can’t work it out.＝It is such a difficult problem that we can’t work it out. 注意：so…that…转换为such…that…，必须保持意思不变。
⑵Many patients are so poor that they can’t afford to go to hospital.
⑶Modern medicine is developing so quickly that we can treat and cure most eye problems.
⑷Dr Ma has done such an important job that people must be really grateful to him.
⒊so…that sb can’t/couldn’t…，such…that sb can’t/couldn’t…引导的结果状语从句的否定式，可与too…for sb to do(注意动词原形之后不能再接宾语)或not＋形容词或副词原级＋enough to do sth互换。
⑴The book cost so much that she couldn’t buy it.＝The book cost too much for her to buy.
⑵He ran so quickly that nobody could catch up with him.＝He ran too quickly for anybody to catch up with. 注意简单句too…for sb to do中的动词不定式之后不能再接宾语。
⑶The child was so young that he couldn’t go to school.＝The child was too young to go to school.
＝The child was not old enough to go to school.