句子中since 和for 的区别（要详细）

We have lived here for ten years.

We have lived here since ten years.

这两句有什么区别

第一句我已经住这10年了

第二句自从10年前我就已经住这了

第2句要比第1句表达的时间长,第一句就是说住这10年了,第2句是说可能住了更久

第一句:我在这里居住10年了

第二句:我10年之前居住在这里

since和for的用法与区别: 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 a clinic since 1949.　 　　Some new oilfields have been opened up since 1976. 　　I have known Xiao Li since she was a little girl.　 　　My brother has been in the Youth League for two years.　 　　I have not heard from my uncle for a long time. 　　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.

for 后跟时间段，而since 后跟表过去的时间点或时间段加ago

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