J-PACT语法知点：连词中的易混知识点

　　语法它的重要性就在于可以帮我们分析英语句子，让我们更好的去写作表达想法，去阅读、解读作者的想法。J-PACT考试内容只测试英文和数学，学生通过J-PACT考试成绩可获取初级学院的入学许可证。下面课窝考试网小编就继续讲解关于J-PACT英语语法知识点：连词中的易混知识点。

　　because, so;although, but

　　上面已经提到，because和so及although和but不连用。

　　例如:

　　Because he was late, he didn't catch the first bus.

　　一定不可以说

　　Because he was late, so he didn't catch the first bus.

　　because, since, as, for表示原因时的区别

　　尽管because, for, since, as都表示原因，但是用法上有不同.

　　because通常表示说话人认为这种理由或者原因是听话人所不知道的.

　　如：He didn't attend the meeting because he had too much work to do.

　　since表示的原因是人们已知的事实，常译作“既然”。

　　如：Since he can't answer this question, you'd better ask someone else.

　　as表示原因与since差别不大，只是语气更弱,多译为“由于”

　　如：As I haven't seen the film, I can't tell you what I think of it.

　　for表示因果关系时，只能放在主句之后，不能放在句首。而且经常是对主句补充说明理由或推断原因。

　　如：It rained last night, for the ground is wet.

　　not…until

　　He stayed there until it was very late.

　　句中，stay是可延续性动词，所以不用not。

　　He didn't leave until it was very late.

　　句中，leave是不可延续性动词，所以用not

　　as, when, while

　　这三个连词都可引导时间状语从句，但用法有所不同。

　　1) 当某事正在进行的时候，又发生了另一件事。While, when, as 都可用来引导表示“背景”的时间状语从句。例如：As/When/While I was walking down the street I noticed a police car.

　　2) 当两个长动作同时进行的时候，最常用的是while。例如：

　　While mother was cooking lunch, I was doing my homework.

　　3) 当两个动作都表示发展变化的情况时，最常用的是as。例如：

　　As children get older, they become more and more interested in things around them.

　　4) 当两个短动作同时发生时，或表示“一边…一边…”时，最常用as。例如：

　　Just as he caught the fly, he gave a loud cry.

　　She looked behind from time to time as she went

　　5) 当从句的动作先于主句的动作时，通常用when。例如：

　　When he finished his work, he took a short rest.

　　6) 当从句是瞬间动作，主句是延续性动作时，通常用when。例如：

　　When John arrived I was cooking lunch.

　　or还是and

　　祈使句+or+陈述句前后是对立的

　　祈使句+and+陈述句前后是统一的

　　(or或and后的陈述句，常用一般将来时)

　　Study hard, or you won't pass the exam.

　　Study hard, and you will pass the exam.

　　两句都可以转换成“If条件句+主句”形式，注意：要去掉or和and：

　　If you don't study hard, you won't pass the exam.

　　If you study hard, you will pass the exam.

　　if, whether

　　if和whether都可作“是否”讲，在引导宾与从句是一般可互换。例如：

　　I wonder whether (if) you still study in that school.

　　I don’t know whether (if) he likes that film.

　　1) 引导主语从句时。例如：

　　Whether he will come to the party is unknown.

　　2) 引导表语从句时。例如：

　　The question is whether I can pass the exam.

　　3) 在不定式前。例如：

　　I haven’t made up my mind whether to go there or not.

　　以上就是小编为大家整理的关于J-PACT语法知识点。更多JPACT考试资料、JPACT考试分数线等问题可以咨询我们。