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5. 時間狀語從句：as的用法
1)某事一發生，另一事立即發生
As the sun rose the frog dispersed. 太陽一出來霧就消散。
They strolled into the garden as the music ceased. 音樂聲一停，他們就走進花園。
2)在某事發生的過程中另一事發生
I heard the murmur of their voices as I crossed the hall. 我走過大廳的時候聽到他們在嘀咕什么。（兩個動作都是一般時態）
Just as he was speaking there was a loud explosion. 正當他在說話的時候，一聲巨響。
（從句用進行時態）
3)兩個動作同時發生
He smiled as he passed. 他路過的時候笑了一下。（兩個都是短暫動作）
As she sang, the tears ran down her cheeks. 她一邊唱歌，眼淚一邊從臉頰淌下。
Helen heard the story as she washed. 海倫一邊洗衣服一邊聽故事。
He saw that she was smiling as she read.
他看到她一邊看著書一邊笑。（兩個都是延續性動作）
We get wiser as we get older.
我們隨著年齡的增長而變得聰明起來。（隨著時間的變化而變化）
6. 時間狀語從句：when的用法
以when引導的時間狀語從句中，既可用短暫性動作也可用延續性動作。
I bought the car when I received my first salary.（短暫性動作）我是在領第一筆薪水的時候買的車。
Don't get excited when you talk.（延續性動作）說話的時候不要激動。
