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are reading. 別人讀書時(shí)不要吵鬧。 sang while she was walking. 她邊走邊唱。 “Before” Clause 在 … 之前 eg: had studied Russian for two years before she came here. 她來這之前已學(xué)了兩年俄語了。 2. Remember to take the medicine before you go to bed. 記住睡覺前吃藥。 “After” Clause 在 … 之后 eg: uncle joined the army after he finished middle school. 他叔叔中學(xué)畢業(yè)后參軍了。 girl had a short rest and did her her homework after she reached home. 那女孩到家后,休息了一會(huì)便做起作業(yè)來 。 “Until” Clause 5 .until 直到 … 為止 eg: 1. I didn’t watch TV until I finished my homework last night. 昨晚我做完作業(yè)后才看電視。 2 .We won’t work until our teacher teaches us how to do it. 直到老師教給我們?nèi)绾巫鲞@工作 我們才開始做。 “Since” Clause 自從 … 以來 eg: 1. I have learned more than two thousand English words since I began to learn English. 自從我開始學(xué)習(xí)英語以來, 我已經(jīng)學(xué)會(huì)了兩千多個(gè)英語單詞了。 2. It is (has been) five years since I worked here. 自從我到這工作以來,已經(jīng)五年了。 “As soon as” Clause soon as 一 … 就 eg: 1. I’ll ring you up as soon as I get home. 我一到家就給你打電話。 2. He will give the letter to you as soon as he see you tomorrow. 他明天一見到你就把這封信給你。