寒假英语总动员知新篇状语从句大party

　三、原因状语从句

　　要点: 由连词because, since, as引导, 也可由for, now that 等词引导

　　我没去上学，因为我生病了。

　　2. Since everybody is here, let’s begin our meeting.

　　既然大家都来了, 让我们开始开会吧.

　　3. As you are in poor health, you should not stay up late.

　　既然你身体不好, 你就不该熬夜.mda.com

　　4.I asked her to stay to tea, for I had something to tell her.

　　我请她留下来喝茶,因为我有事要告诉她.

　　.难点because , since , as , for,辨析

　　在语气上，because 最重, 表示的是直接理由,回答why 时只能用它. 其次是since, as ,一般不表示原因, 而是表明理由, 进一步说明.(译为：由于，既然). for 被认为是复合句的并列连词(常用于推断),表示理由.