有since 一定是完成时的标志吗？

aj_goodnews · 发表于 2010-8-7 11:51:19

如题，这两天做GWD是一道题做错了，看了一下曼哈顿论坛的解释，看到大牛RON的解释，有点不太懂，他说：actually, the only acceptable tense for a clause modified by "since..." is the present perfect.

be careful! note that this is for the clause being modified by "since...", NOT for the words following "since".

什么是words following "since". 谁能给个例句吗？

aj_goodnews · 发表于 2010-8-7 23:01:54

ding ding

花子落落 · 发表于 2010-8-7 23:21:51

同问~

Inflation · 发表于 2010-8-7 23:48:13

我觉得这位大牛是说since还可以表原因， since 表原因后面接句子，这时就不是现在完成时的标志了。
for example: GWD-12-Q32
Prospecting for gold during the California gold rush was a relatively easy task,since erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity put gold literally within reach of anybody with a pan or shovel.

swimswan · 发表于 2011-3-2 20:06:07

有since 一定是完成时的标志吗？

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