2017年12月英语四级语法：比较since和for

英语自学网

　　我们都知道，在大学英语四级考试中，单独考察英语四级语法的题型很少，但是英语四级语法知识点却贯穿整张试卷，下面是新东方网英语四级频道为大家整理的大学英语四级语法知识，希望可以为大家带来帮助。
        　　2017年12月大学英语四级语法大全目录
        　　11.12 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 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.
        　　2017年12月大学英语四级语法大全目录