请教three years later与three years ago的区别?

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请教three years later与three years ago的区别?
请教three years later与three years ago的区别?

请教three years later与three years ago的区别?
1) three years later 以过去某一点为参照,意思是:“三年后”如:In 1986,I went to Beijing,and three years later,I returned to my hometown to be a teacher in a primary school.
2) three years ago 以现在为时间点为参照,往回数三年,就是“三年前”的意思.句子用一般过去时.如:It is 2011,I am a college student now in Nanjing university,but three years ago,I was a middle school student.
另外注意:以现在为起点,往后数的三年,我们应该用 In three years,即“三年后”或“今后三年内”.如:I will buy a new house in three years.
I will finish doing this work in 3 hours.