介系詞 before 表示在...之前; after 表示在...之後; during 表示在...期間。
Amanda has to get to school before 7:00 this morning.
Amanda今天必須在上午7時前去學校。
One day after dinner, Lois went to the park for a walk.
有一天晚飯後,Lois 去公園散步。
before 與 after 也可以當連接詞使用。
Don't forget to brush your teeth before you go to bed.
雖然 during 是介系詞, while 是連接詞; 這兩個字卻有相同的意義。
Why does the Moon sometimes come out during the day?
為什麼月亮有時白天出來?
While I was taking a snap, the fire alarm rang suddenly.
當我正在小睡時,火警警鈴突然響起。
這句子的 While 也可以用 When 或 As,意思是一樣的。
When I was taking a snap, the fire alarm rang suddenly.
As I was taking a snap, the fire alarm rang suddenly.
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