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as/when/while; after; before; since; till/until; whenever; no sooner … than / hardly … when 副词
immediately; 名词 短语
the moment; the minute; the second; each (every) time; the day (year); next time; the first (second /last ) time; by the time Examples: When/As/While he was eating his breakfast, he heard the door bell. It has been two years since I came to Beijing. Whenever we met with difficulties, they came to help us. I got in touch with him immediately I received his letter. My sister came the moment she got my message. Every time I catch a cold, I have pain in my back. 从句动词为非延续性动词: The boy cried when he saw his mother. 从句动
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