16、Number用法简化版：
① 不作核心词： a number of / numbers of + 复数名词+ 复数谓语，此时表示一定数量的XXX，
核心词是那个复数名词，用法上相当于some等形容词。
② 作核心词：
ⅰ 被具体化为几个数字; New Jersey has one of the 5 highest numbers of reported cases of Lyme diseases in the Unite States.
ⅱ 被具体化倾向不明显，表示一定数量; …..;It’s numbers are now five-times greater than when the use of DDT was sharply restricted in the early 1970’s.
ⅲ 固定搭配： in numbers/ in number 表示在数值方面的减小
在句中作状语; eg
decline/ downturn in number(s)
ⅳ the number of + 复数名词 + 单数谓语
ⅴ the number(s) of 表示标号、数字标识; eg The number of machine part A is 201.
17、 Whereas引导从句时，要求和主句在成分上核心逻辑有对称;若有介词短语，那么介词短语的位置一般要求一致。
Eg In cooking, small quantities of spices are used, whereas in medicinal usage spices are taken in large quantities in order to treat particular maladies.
18、 Like/unlike 后只加名词表示比较，不能加不定式短语、分词短语(like cooking with spices)、句子或者介词短语;
如果要加这些成分，需要变Like/unlike为 whereas
19、 副词的位置：even放在比较级前修饰(even better); ever放在住动词后(I have ever done…); only和first放在被强调成分之前; alone放在被强调成分之后。
20、 两个不同层次，但在逻辑上有联系的句子，用分号(semicolon)连接最好。
21、 嵌入式关系分句：有种关系成分(定语从句)，即是先行项的后置修饰语(定语)，
又是另一个分句结构的宾语(宾语从句)。
Eg The word wildlife fund has declared that global warming, a phenomenon that most scientists agree is caused by human being’s burning of fossil fuels, will create haroc among migratory birds by altering the environment in ways harmful to their habitats.
① 定语从句：a phenomenon that is caused by…
② 宾语从句：most scientists agree that the phenomenon is caused by…
22、 not one of = none of +复数名词 +单数谓语
23、 ones在比较句中不能指代people应用those
eg Only seven people have been killed by white shark, fewer than those killed by bee strings.
24、 After having done sth. 不正确。 After 已经表示了 a sequence of a succession of events, 应替换成 after sth./ sb. have done 或者 after sth./sb. did 之类的从句形式。
(ps：这个平时很少见的语法点
我考到了 = =)
25、 which不能指代前面一句话，但in which case 就可以。
26、 excepting 多用于否定意义的句子中， eg Everyone helped, not excepting John.
Except：除了 不同类别的排出
Besides： 除此之外还有
Apart from： 可替代besides或 except
27、 while at the same time 是正确的
28、 despite的几个习惯用法：
① despite being offended $1000 to do so
② despite recent increase in sales
③ despite protests from some waste disposal company
④ despite the growing number of people who…
29、 amount用于不可分割的物体： 如 沙和水; 用less 修饰。
30、 时间和钱通常不可数;但特指specific coins or bills 时可数
Eg I have fewer than 5 state quarters to go to make my collection complete.
31、 More + adj. + n. 往往有修饰歧义; more既可以作adv. 修饰 adj. + n. ; 也可以做adj. 和 第二个adj.一起 修饰n.
32、 伴随结果状语的两种常见形式： with the result that…/ resulting that…
33、 In order to 不如 to do 简洁， 同时也不能做主语
34、 Fish之类的单复数同型词，作单数时一定有冠词(a the an )
35、 a variety of + 复数n. 谓语用复数
而 a body of / a collection of / an array of / a series of / a set of / a portion of / a group of / a constellation of / a team of + 复数n. + 单数v.
可以简单记忆为表示整体与部分关系的词