小学六年级英语语法讲解之比较since和for

　　英语的应用越来越广泛了，我们必须好好来学习英语知识。对此小学频道编辑为大家整理了小学六年级英语语法讲解：比较since和for。详情如下：

小学六年级英语语法讲解之比较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。

　　I have lived here for more than twenty years.

　　I have lived here since I was born.

　　My aunt has worked in aclinic since 1949.

　　Some new oil fields have beeno pened up since1976.

　　I have known XiaoLi since she was a little girl.

　　My brother has been in the Youth League for two years.

　　Ihavenotheardfrommyuncleforalongtime.

　　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。)

　　小窍门： 当现在完成时+一段时间，这一结构中，我们用下面的公式转化，很容易就能排除非延续动词在完成时中的误使。

　　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.

　　希望大家能够认真阅读这篇小学六年级英语语法讲解：比较since和for，以便在英语学习上取得优异的成绩。

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