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the other office workers, I heard a loud sound.be about to do, be doing等表示即將或正在做某事時,常用 when引導(dǎo)從句表示突然發(fā)生的動作。4a Make sentences using by the time or before.1. Tim went into the bathroom. Mary got up. By the time Mary got up, Tim had already gone into the bathroom.2. The coffee became cold. I put cream (n. 奶 油 ) in the coffee. __________________________________ __________________________________Before I put cream in the coffee, the coffee had bee cold.3. The teacher collected the math homework. I got to school. __________________________________ __________________________________4. I pleted the work for my boss. The workday (n. 工作日 ) ended. __________________________________ __________________________________By the time I got to school, the teacher had collected the math homework.I had pleted the work for my boss before the workday ended.5. The movie started. I arrived at the cinema. __________________________________ __________________________________6. My mother finished making the apple pie (n. 果餡派 ). I got home from my language course. __________________________________ __________________________________ __________________________________The movie had started, before I arrived at the cinema.By the time I got home from my