比较since和for9 f. H: z, Q2 Z
Since 用来说明动作起始时间，for用来说明动作延续时间长度。 \/ V F% ^: B
I have lived here for more than twenty years.
2 S+ z* b5 U2 d9 J6 k& B I have lived here since I was born……( s; u) t6 D; Z/ T' d
My aunt has worked in a clinic since 1949.+ ~* \4 w& v T9 d) t& `
Some new oilfields have been opened up since 1976." X3 ~) {/ R% [$ t p& U- s
I have known Xiao Li since she was a little girl. B' A$ [2 E; ^: u
My brother has been in the Youth League for two years.
% t& E! }9 @( M I have not heard from my uncle for a long time. s# i0 b# s7 O$ Q4 b9 t; z
注意：并非有for 作为时间状语的句子都用现在完成时。0 \4 ~0 K. }9 \5 x; M
I worked here for more than twenty years.
% t) E! s8 ^8 i/ {; V6 s （我现在已不在这里工作。）
& {& r* G+ ?; q5 x( A) N4 _& L I have worked here for many years./ m7 L) r* j. O. V
（现在我仍在这里工作。）6 v/ D" z& } [, ]" \
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。( J) s/ J! I5 x) I( b
1） （对） Tom has studied Russian for three years.
' ?! [6 F6 H( ]5 u; r9 F6 L = Tom began to study Russian three years ago, and is still studying it now.2 q' o& H b6 r* O# a
2） （错） Harry has got married for six years.
: e+ C; x3 |) ?5 @2 u$ a" c = Harry began to get married six years ago, and is still getting married now.
+ \0 p) L; D3 A `3 O 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. |
发表于 2012-8-14 12:34:02
