since引導的原因狀語從句的例句

He has studied very hard since he came to our school.自從來到我們學校，他學習就非常努力.

Great changes have taken place in our school since you left.自從你離開這裏，我們學校發生了很大的變化.

Since you are free today， you had better help me with my mathematics. 既然今天你休息， 你最好幫我補習數學。

since引導的原因狀語從句的例句

since引導的原因狀語從句翻譯成 既然

例如 since you made a mistake， you have to say sorry.