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.

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.

186. weather, if

　当是否解时，只有在宾语从句中二者可以互换，其余都用weather，当如果解时用if I don’t know if/whether he will come. If he comes, I’ll let you know.

185. besides, except, except for

　besides除了…还(包括在内)except除了(不包括在内)，except for整体…除了某一点以外The composition is good except for a few spelling mistakes.

184. until, not…until

　until到…为止， not…until直到…才(常跟点动词连用)I waited until 3:00. He didn’t come until 3:00.

183. above, on, over

　above在上面，不接触，on在上面，接触，over在正上方fly over the hill

182. on the way, in the way

　on the way在前往…的路上，in the way挡路The chair is in the way.

181. through, across

　through穿越空间，across在…上穿过through the forest, across the desert

180. in a voice, with one voice

　in a voice出声地，with one voice异口同声地They refused with one voice.

179. in the sun, under the sun

　in the sun在阳光下，under the sun地球上，全世界people under the sun