5、although和though引导让步状语从句往往用法一样，但注意以下区别：①although用于各种文体，而though则多用于非正式的口语或书面语中。注意由although, though引导的从句后，主句不能用but，但可用副词yet, still。例如：Although/ Though it rained all the morning, they still went on working.(或yet they went on working)②though常与even连用，even though表示强调，意为“即使”，但不能说even although，例如：Even though I didn’t understand a word, I dept smiling. ③though可用作副词，意为“然而”，常用逗号与句子分开。although则不能这样使用，它只作连词。例如：It was a quiet party, I had a good time, though.

4、because, since, as引导原因状语时注意使用上的区别：①如果原因构成句子的最主要部分,一般用because ,因此because引导的从句往往放在句末。用why提问的句子，一定用because回答。例如：He had to stay at home yesterday because he was ill.；②如原因已为人们所知，或不如句子的其他部分重要，就用as，或 since。since比as更正式些。as和since引导的从句一般放在句子的开头。例如：As you are tired, you had better rest./ Since everyone is here, now let’s begin.

3、till, until作为介词式从属连词引导时间状语短语或状语从句，用于否定句时，结构为not …until (till)，主句谓语动词延续与非延续皆可，意为“直到…才…”。用于肯定句时，只与延续性动词连用，表示“到…为止”。例如：They played volleyball until (till) it got dark./ They didn’t talk(延续性动词)until (till) the interpreter(译员)came./ He didn’t go to bed(非延续性动词)until (till) the his father came back.；until可以放在句首，till则不行，例如：Until the last minute of the match we kept on playing./ Not until he finished his work did he go home.(倒装)；till, until只用于时间，以下句子是错误的：We walked till the edge of the forest.(要用as far as或to)。

2、before作连词一般表示时间，意为“在…之前”，但有些句子中这样译就显得别扭。试看以下句子的翻译：He almost knocked me down before he saw me.他几乎把我撞倒才看见我；Before I could get in a word he had measured me.我还没来得及插话，他已经给我量好了尺寸。

1、当while, when, as引导时间状语从句时的区别：①while引导的状语从句中动词必须是持续性。谓语动词多为进行时，或状态动词的一般时。while 的这些用法可用when代替，等于 “at the time that”, “during the time that”。例如：Please keep quiet while (when) others are studying；② when除可指一段时间外，还可用来指一点时间，等于 “at the time”，也就是说when引出的时间状语从句中的谓语动词可以是终止性的，也可以延续性的。因此主句和从句的谓语可以是一般时，进行时，或完成时。例如：When I went into the lab, the teacher was doing an experiment.(when不能换成while)He often makes mistakes when he is speaking English.(when可换成while)③as常可与when，while通用，但强调“一边、一边”。例如：As (when, while) I was walking down the street, I noticed a police car in front of number 37. ④when引导的状语从句中的主语与主句主语一致，主、谓是“主语+系动词”结构时，这时主语和系动词可以省略。例如：When (he was) young, he worked for a rich man./ She’ll be here to give you help when (if it is) necessary. ⑤when有时代替if，引导条件句，意为“如果”、“假如”，例如：I’ll come when (if) I’m free.

38. ---- What do you think about English?　　　　　 ---- It's a difficult language _____.

　　 A. speaking　　　　　 B. to be spoken　　　 C. to speak　　　　　 D. spoken

37. I really don't know ____ .

　　 A. to swim　　　 B. how to swim　　 C. to swim how　　　 D. how swim

36. We all think it most foolish ______ this mistake.

A. for you making　　 B. of you to make　　 C. you to make　　　　 D. for you to make

35. He told her ______ there at once.

　　 A. get　　　　　　　　 B. gets　　　　　　　　 C. should get　　　　　 D. to get

34. We did not expect our offer _____ so quickly.

　　 A. rejected　　　　　　 B. to reject　　 .　　　 C. to be rejected　　　 D. rejecting