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The children went out just now. å©å们åæåºå»äºã
She died ten years ago. 她åå¹´åå°±å»ä¸äºã
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I have been to Peking many times. æå¤æ¬¡å»è¿å京ã
They have already published the results of their experiments.ä»ä»¬å·²ç»å表äºå®éªçç»æã
2. 表示ä»è¿å»ææ¶é´å¼å§ä¸ç´å»¶ç»å°ç°å¨ï¼å¯è½è¿è¦ç»§ç»ä¸å»ï¼çå¨ä½ã
常ç¨äºå«æ延ç»æä¹çå¨è¯ï¼å¹¶ä¸ä¸è¬è¦è·ä¸ä¸ªè¡¨ç¤ºä¸æ®µæ¶é´çç¶è¯ï¼å¦sinceï¼for two yearsï¼so farï¼in recent yearsçãä¾å¦ï¼
He has lived here since 1949. èªä»1949年以æ¥ï¼ä»ä¸ç´ä½å¨è¿å¿ã
I have studied English for two years. æå¦è±è¯å·²ç»ä¸¤å¹´äºã
è¿å»å®ææ¶ è°è¯å½¢å¼ï¼ç±had+è¿å»åè¯ææï¼è¡¨ç¤ºå¨è¿å»æä¸æ¶å»ä»¥åå·²ç»å®æçå¨ä½ï¼å¸¸ç¨ä¸ä¸ªç±byï¼beforeçä»è¯æè¿è¯å¼å¯¼çã表示å°è¿å»æä¸æ¶é´ä¸ºæ¢çæ¶é´ç¶è¯ãè¿ä¸æ¶æï¼å¸¸ç¨äºå®¾è¯æå®è¯ä»å¥ä¸ãä¾å¦ï¼
John had learned some Chinese before he came to China. 约翰æ¥ä¸å½ä»¥åï¼å¦è¿ä¸äºæ±è¯ã
By the end of last year, I had worked in this college for ten years. å°å»å¹´å¹´åºä¸ºæ¢ï¼æå¨è¿æå¦é¢å·¥ä½å·²æåå¹´äºã
He found the book that he had lost. ä»æ¾å°äºä»ä¸¢å¤±çé£æ¬ä¹¦ã
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(1) We had no sooner reached home than it began to rain.
No sooner had we reached home than it began to rain.
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(2) He had hardly entered the office when (before) the phone rang.
Hardly had he entered the office when (before) the phone rang.
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æ£ç¡®ï¼They finished that work yesterday.
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é误ï¼All delegates arrived before 6 yesterday afternoon.
æ£ç¡®ï¼All delegates had arrived before 6 yesterday afternoon.
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