摘要：
Heissittingontheleft/right.ThemountainyouseetotherightisthePurpleMountain.13.原因句型Hedidn'tg... He is sitting on the left/right.
The mountain you see to the right is the Purple Mountain.
13. 原因句型
He didn't go to school because
he was ill.
Since we are all here, let's begin our meeting.
It might rain yesterday, for the ground was wet.
Now (that) we have finished the work, we can go home.
I am glad to meet you.
I am sorry that I hear that.
Thank you for your help.
That is why he failed to come.
He didn't come because of/on account of the weather.
He went out of curiosity.
I succeeded thanks to his help.
This failure is due to the fact they lack experience.
