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ä¾å¦ï¼(4) He said that he did not want to go .
(5) Many things have happened since I last saw him.
(6) You may come if you want to.
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å¦ï¼I studied hard until 12 o'clock last night.
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å¦:He didn't go to bed until his mother came back.
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since å¼å¯¼çæ¶é´ç¶è¯æ¯å¨ä½çå¼å§æ¶é´ï¼å¦:I have studied English since 1990.
èbyå¼å¯¼çæ¶é´ç¶è¯é常æ¯å¨ä½çç»ææ¶é´ï¼å¦ï¼I had learned 25 English songs by the end of last term.