（错）I have received his letter for a month.

　　（对）I haven’t received his letter for almost a month.

　　3.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.我在这儿住了20多年了。

　　I have lived here since I was born.我自出生就住在这儿。

　　I have not heard from my uncle for a long time.我好久没收到叔叔的信了。

　　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. 我在这里工作过20多年。(我现在已不在这里工作。)

　　I have worked here for many years.我在这里工作了多年了。(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用。

　　汤姆学习俄语有3年了。

　　(对)Tom has studied Russian for three years.

　　=Tom began to study Russian three years ago，and is still studying it now.

　　Harry结婚6年了。

　　(错)Harry has got married for six years.

　　=Harry began to get married six years ago，and is still getting married now.

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