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例如 : I don’t know when the plane 。 ① 在動(dòng)詞不定式之前只能用 whether。一般情況下 ,兩者可互換 ,在口語(yǔ)中多用 if。例如 : His father is worried about whether he may lose his 。例如 : Can you tell me how I can get to the bus stop? →Can you tell me how to get to the bus stop? 你能告訴我怎樣去公交車(chē)站嗎 ? Ⅰ .單項(xiàng)填空 ( C )1.—I wonder . —Yes,of course. we can buy the parts often you hear form your sister I may have a word with you he arrived late yesterday ( A )2.—What did he ask just now? —He wondered .