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

178. in the market, on the market

　in the market表示场所或地点，在市场上，on the market出售 He sells fish in the market. Fresh vegetables are on the market now.