when为什么没有介词的用法呢 when能作介词吗?
\u5355\u8bcd when \u5728\u8fd9\u4e2a\u53e5\u5b50\u4e2d\u7684\u8bcd\u6027\u662f\u4ec0\u4e48\uff1f\u6211\u7684\u7c7b\u6bd4\u4f3c\u4e4e\u51fa\u9519\u4e86\u3002before\u6709\u4ecb\u8bcd\u548c\u8fde\u8bcd\u7684\u53cc\u91cd\u8bcd\u6027\uff0c\u4f46\u662fwhen\u6ca1\u6709\u4ecb\u8bcd\u7684\u8bcd\u6027\u3002
\u8fd9\u91cc\u4e0d\u80fd\u5982\u6b64\u7c7b\u6bd4\uff0c\u5982\u679cwhen\u6709\u4ecb\u8bcd\u7684\u8bcd\u6027\uff0c\u90a3\u4e48\u8fd9\u6837\u7406\u89e3\u5c31\u662f\u53ef\u4ee5\u7684\u3002\u4f46\u662f\u95ee\u9898\u662fwhen\u6ca1\u6709\u4ecb\u8bcd\u8bcd\u6027\uff0c\u6240\u4ee5\u4f60\u53ea\u80fd\u628awhen eating a cooked fish\u8fd9\u4e2a\u7406\u89e3\u6210\u8fde\u8bcdwhen\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5when you are eating a cooked fish\u7684\u7f29\u5199/\u7701\u7565\u5f62\u5f0f\u4e86\u3002
\u6240\u4ee5\u8fd9\u4e2a\u95ee\u9898\u7684\u5173\u952e\u662fwhen\u6ca1\u6709\u4ecb\u8bcd\u8bcd\u6027\uff0c\u4e0d\u80fd\u5012\u7740\u63a8\u7406\u3002
when \u4f5c\u4e3a\u5173\u7cfb\u526f\u8bcd,\u5728\u5b9a\u8bed\u4ece\u53e5\u4e2d\u505a\u65f6\u95f4\u72b6\u8bed,\u76f8\u5f53\u4e8e\u4ecb\u8bcd+\u5173\u7cfb\u4ee3\u8bcd
I still remember the year when we met for the first time. (when= in which )
Sunday is the day when very few people go to work\uff08when= on which\uff09
when\u505a\u7591\u95ee\u526f\u8bcd,When can you come?
when还可以作疑问副词，引导特殊疑问句或名词性从句，表示“什么时候”，作关系副词，引导定语从句，先行词也是表示时间的名词。
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