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18.---Could you tell mewhether we will go on a picnic if it is fine(如果天气好我们是否去野餐) tomorrow?
---I have no idea.( if )

分析 whether we will go on a picnic if it is fine.

解答 答案:whether we will go on a picnic if it is fine.这里是要译出tell的宾语从句部分,如果天气好我们是否去野餐,if/whether表示如果,引导的条件状语从句,结合时间状语tomorrow表将来,遵循主将从现,主句是问句我们是否去野餐,用一般将来时will+动词原形,用if表是否作为宾语从句的引导词,后加陈述语序,主语we,去野餐go on a picnic,故if we will go on a picnic,条件状语从句--如果天气好,用一般现在时,if表如果,天气好it is fine,因有if引导的条件状语从句,故宾语从句选择连词whether表是否,避免混淆,故答案是whether we will go on a picnic if it is fine.

点评 if和whether的区别:
1 在动词不定式之前只能用whether.
2 在whether …or not 的固定搭配中.
3 在介词后,只能用whether.
4宾语从句放在句首表示强调时,只能用whether.
5用if会引起歧义时,只用whether.如用whether可避免歧义.

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