later、after、ago、before的用法：①"一段時間+later/ago"分別表示"(多久)以后/以前",主要用于過去時態。②"after/before+某個時刻"分別表示"在某時刻之后/之前",此時兩個詞是介詞。③ago與before：ago只能用于過去時,before用于完成時。如：He had an accident a week ago.(一周前出了一個事故)/ Some years later, the boy became a very famous singer.(數年后這個男孩成了著名的歌唱家)/ Have you been there before?(你從前到過那兒嗎?)/ After a few years he gave up smoking.(過了幾年他戒了煙。)

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