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en 連用 A was/were +doing sth When B +did sth. 長時動作 短時動作 What were they drawing when the teacher came in? Mary Jim Li Lei Lily Lucy Sue What was Lilei drawing when the teacher came in? He was drawing an elephant. What were the twins drawing when the teacher came in? They were drawing a car. 四、在復(fù)合句中,如果主要動作和背景動作都是延續(xù)的或同時發(fā)生的,那么主從句的動詞都可用過去進行時。 如: While 引導(dǎo)的兩個動作都是延續(xù)的或兩個動作 同時進行) While What were they doing yesterday afternoon? He was playing basketball while she was sleeping. Exercises Did you see a man in black pass by just now? No, newspaper. reading read reading B 解析 由 just now判斷應(yīng)用過去時態(tài),又由語境 “ 穿黑衣服的人路過時,我