知識點(diǎn)二ago與before

兩詞都可作“以前”解，但有所區(qū)別。

ago是副詞，用于時(shí)間名詞之后，表示從現(xiàn)在算起的 若干時(shí)間以前；before作介詞，用于時(shí)間名詞之前，通常表示從過去某時(shí)間算起的若干 時(shí)間以前，也可單獨(dú)使用，表示籠統(tǒng)、不明確的“以前”。

4.  (翻譯) 三天前他們班去上海旅行了。

Their class had a trip to Shanghai.

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