181. through, across
through穿越空間，across在…上穿過 through the forest, across the desert
182. on the way, in the way
on the way在前往…的路上，in the way擋路 the chair is in the way.
183. above, on, over
above在上面，不接觸，on在上面，接觸，over在正上方 fly over the hill
184. until, not…until
until到…為止， not…until直到…才（常跟點動詞連用）i waited until 3:00. he didn't come until 3:00.
185. besides, except, except for
besides除了…還（包括在內）except除了（不包括在內），except for整體…除了某一點以外 the composition is good except for a few spelling mistakes.
186. weather, if
當是否解時，只有在賓語從句中二者可以互換，其餘都用whether，當如果解時用if i don't know if/whether he will come. if he comes, i'll let you know.
187. and, or
and並且，or或者，否則，常用於否定句中 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
原因由強到弱為：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 (表時間)
when從句動詞點動詞，持續性動詞均可，as重在表示動作同時發生，伴隨進行，while從句動詞為持續性動詞 while i slept, a thief broke in.
190. the same…as, the same…that
the same…as和…一樣的（相似但不同一）， the same…that 同一物體 this is the same pen that i used yesterday. (同一支筆)
191. as well, as well as
as well也，常放於句末，和and連用表示既…又；as well as並列連詞，不但…而且… he is a professor, and a writer as well.
192. such…as, such…that
such…as像…樣的，such…that如此…以至於 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連詞，連線兩句話，because of介詞短語，後接詞或短語 he didn't go to school because of his illness.
194. in order that, in order to
表目的，in order that後接句子，in order to後接動詞原形 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
for example一般只列舉一個，such as列舉多個例子 i have been to a lot of american cities, such as new york, atlanta and chicago.