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We had learnt 20 English songs by the end of last month. The Past Perfect Tense 過去完成時(shí) 用連詞: when, before, after或者短語:by the time 引導(dǎo)的時(shí)間狀語從句。 The plane had taken off when I reached the airport. By the time I got up , my brother had left home. The Past Perfect Tense 過去完成時(shí) By the time I got outside, the bus had already left. the policeman get to the shop Tom run away By the time the policeman got to the shop, Tom had run away. Speakingfreely : By the time… or When… Liu Mei wake up the concert be over By the time Liu Mei woke up, the concert had been over. his grandma e from America Li Ming grow up By the time his grandma came from America, Li