18.---Could you tell mewhether we will go on a picnic if it is fine(如果天氣好我們是否去野餐) 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.這里是要譯出tell的賓語從句部分,如果天氣好我們是否去野餐,if/whether表示如果,引導(dǎo)的條件狀語從句,結(jié)合時間狀語tomorrow表將來,遵循主將從現(xiàn),主句是問句我們是否去野餐,用一般將來時will+動詞原形,用if表是否作為賓語從句的引導(dǎo)詞,后加陳述語序,主語we,去野餐go on a picnic,故if we will go on a picnic,條件狀語從句--如果天氣好,用一般現(xiàn)在時,if表如果,天氣好it is fine,因有if引導(dǎo)的條件狀語從句,故賓語從句選擇連詞whether表是否,避免混淆,故答案是whether we will go on a picnic if it is fine.

點評 if和whether的區(qū)別:
1 在動詞不定式之前只能用whether.
2 在whether …or not 的固定搭配中.
3 在介詞后,只能用whether.
4賓語從句放在句首表示強調(diào)時,只能用whether.
5用if會引起歧義時,只用whether.如用whether可避免歧義.

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