在临近中考期间，学生们应当适量做些体育活动，锻炼身体，放松心情。接下来，与小编一起来看看成都中考英语必备知识点。

成都中考英语必备知识点：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.

小编为大家精心推荐的成都中考英语必备知识点还满意吗?相信大家都会仔细阅读，加油哦!更多中考内容请关注【2016中考作文】【2016年中考试题及答案】。同时小编还为大家整理了【全国各省市重点高中名录】，希望大家能够进入理想的高中。

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