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2. How often do you eat vegetables?你多久吃一次蔬菜? how often 意為“多久”,問動作發(fā)生的頻率。 often does your sister write t o you? 你妹妹多久給你寫一次信? How often does Mary call her mom? 瑪麗多久給她母親打一次電話? How often do you go out for a trip? 你多久出去旅游一次? 類似的詞組還有“ how long”、“ how soon”、“ how far”等。 how long意為“多久(問時(shí)間的長短)”或“多長(問物體的長度)” long do you study here? 你在這兒學(xué)習(xí)多久了?(問時(shí)間的長短) How long is your hair? 你的頭發(fā)有多長?(問物體的長度 how soon 意為“多快,多久以后”。 soon will the train arrive? 火車多快 能到達(dá)? how far 意為“多遠(yuǎn)”,問距離。 far is your home? 你家有多遠(yuǎn)? How far is the library? 圖書館有多遠(yuǎn)? 3. Riding a bike is exercise. 騎自行車是鍛煉。