before,when,whileçè¯åé¢å¯ä»¥ç´æ¥ç¨éè°è¯å½¢å¼ï¼ç¸å½äºè¿äºè¯å¼å¯¼çä»å¥ï¼æ¯çç¥äºç¸åç主è¯ãè¿å¥è¯å¯ä»¥æ¯ï¼Staff remaining in the lounge should notify their immdiate supervisors before they returned to their work.ç¨-ingå½¢å¼ï¼æ¯è¯¥å¨è¯ä¸ä¸»è¯ä¹é´æ¯ä¸»å¨å
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¶è¿å»åè¯å½¢å¼ãHe was surprised when (he was) asked to leave at once.
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