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186. whether, if
当是否解时，只有在宾语从句中二者可以互换，其余都用whether，当如果解时用if I don't know if/whether he will come. If he comes, I'll let you know.
187. and, or
and并且，or或者，否则，常用于否定句中 I don't like apples or bananas.Hurry up and you'll catch the bus. Hurry up or you'll miss the bus.
188. because, since, as, for
原因由强到弱为：because, since/as, for. 在句中的位置如下：1)…because… 2) Since/as…, …
3) …, for… Since I was ill, I didn't go.
189. when, as, while (表时间)
when从句动词点动词，持续性动词均可，as重在表示动作同时发生，伴随进行，while从句动词为持续性动词 While I slept, a thief broke in.
190. the same…as, the same…that
the same…as和…一样的（相似但不同一）， the same…that 同一物体
This is the same pen that I used yesterday. (同一支笔)
191. as well, as well asas well也，常放于句末，和and连用表示既…又；as well as并列连词，不但…而且…
He is a professor, and a writer as well.
192. such…as, such…that
such…as像…样的，such…that如此…以至于 He is not such a fool as he looks like.
He is such a good student that all the teachers like him.
193. because, because of
because连词，连接两句话，because of介词短语，后接词或短语
He didn't go to school because of his illness.
194. in order that, in order to
表目的，in order that后接句子，in order to后接动词原形
I got up early in order to catch the first bus. I got up early so that I could catch the first bus.
195. for example, such as
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