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

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