2012中考英语冲刺必备知识 23-中考-中考英语-池州中考-池州中考英语-出国留学百科常识-出国留学网

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2012中考英语冲刺必备知识 23

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    比较since和for
    Since 用来说明动作起始时间，for用来说明动作延续时间长度。
    例如：
    I have lived here for more than twenty years.
    我住在这儿二十多年了。
    I have lived here since I was born.
    我从出生起就住在这儿了。
    注意：并非有for 作为时间状语的句子都用现在完成时。
    I worked here for more than twenty years.
    (我现在已不在这里工作。)
    I have worked here for many years.
    (现在我仍在这里工作。)
    注意：用句型转换的方法，很容易排除非延续动词在有for/since结构的完成时中的误用。
    1)(对) Tom has studied Russian for three years. = Tom began to study Russian three years ago, and is still studying it now.
    2)(错) Harry has got married for six years. = Harry began to get married six years ago, and is still getting married now.
    显然，第二句不对，它应改为 Harry got married six years ago. 或 Harry has been married for six years.

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