第一句中,after后面只有the event这个名词短语,所以是介词.
而第二句中,after后面是you leave这个句子,所以是连词.
总结：介词后面只能加名词,代词,动名词等名词性成分,而连词后面则加正常的主谓等结构的完整句子
区分介词和连词 It is easy to be wise after the event after为何是介词
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after是介词,介词怎么可以引导从句呢