17.such as; that is; namely; for example的辨析：
(1) such as 用来列举事物时, 一般列举同类人或事物中的几个例子且所列举事物的数量不能等于它前面所提到的总和, such as后面不打“,”;
(2)that is或者namely用来列举事物时, 一般列举同类人或事物中的几个例子且所列举事物的数量等于它前面所提到的总和, that is 或者namely后面通常要打“,”；
(3) for example用来举例说明某一论点或情况, 一般只举同类人或物中的“一个” 为例, 作插入语, 可位于句首, 句中或句尾, 通常与所给的例子用逗号隔开, 其后的例子可以是从句。
e.g. I’d like to keep a pet, for example, a dog.
My daughter studies four subjects in school, that is , Chinese, math, English and P．E.
We all study foreign languages, such as English, French or Japanese and so on.
I like animals, such as dogs, bears and pandas.
He has ever been to many countries, for example, Australia.
18. because与because of的辨析：
(1)意思都为“因为，由于”；
(2) because为连词，后接句子；
(3) because 为介词短语，后接非句子，相当于due to, owing to等。
e.g. I must stay at home because the bad weather.
Tom got the first prize because he performed the best in the class.
19. deal with 与do with的辨析:
(1)deal with ，deal为不及物动词，常与疑问词how连用，表示“怎么处理；对待”
(2)do with，其中的do为及物动词，表示“怎么处理；对待”时，与疑问词what连用。
e.g. I don’t know how they will deal with the problem.
= I don’t know what they will do with the problem.
20. leave的用法辨析：
(1)作名词，意为“树叶”；复数形式为leaves;
(2)作动词，意为“离开”；
(3)leave与leave for的辨析：
①leave意为“离开（某地），留下(leave sb. doing sth.留下某人单独做某事)”；
②leave for意为“出发到某处”。
e.g. We must leave early in the morning.
Don’t leave your children playing with fire.
He left for Beijing yesterday.
Most leaves turn yellow, red or brown in autumn.
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