è¿å»è¿è¡æ¶å¤ç¨å¨whenå¼èµ·çä»å¥ä¸ï¼è¡¨ç¤ºæäºåçæ¶æ个å¨ä½æ£å¨è¿è¡ã常æçæ å¿è¯æï¼at that time e.g:When my father came back I was doing my homework.ä¹è¡¨ç¤ºè¿å»çæ个æ¶é´æ£å¨è¿è¡çå¨ä½ãæ å¿è¯æï¼at 8:00am yesterday at this time last night å
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