if可以引导让步状语从句。例如:
I'll do it, if it takes me all afternoon. 即使这件工作会用去我整个下午,我也要做。(if it takes me all afternoon 是让步状语从句,修饰主句中的 do)
If he is little , he is strong. 他虽然小,但却很强壮。(If he is little 是让步状语从句,修饰主句中的 is )
I'll do it, if I die in the attempt. 即使我尝试做这件事会丧命,我仍然要做。( if I die in the attempt 是让步状语从句,修饰主句中的 do )
(以上全部摘自《刘毅英语语法宝典》p.524)
《韦氏高阶》
if
5 : even though : although
It was an interesting if unbelievable story.
Her actions were understandable, if not forgivable.
He had to perform an annoying, if necessary, task.
a fair, if tough, boss
The weather was good, if not great.
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