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：

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。