they often play chess after they have had supper从句为什么用完成时?

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• They often play chess after they have had supper.这里 have had supper.怎么理解They often play chess after they have had supper.这里 have had supper.怎么理解,是不是从句的发生时间在主句之前,用完成态,这里的现在完成时态是不是根据主句的时间,如果主句是过去,从句过去完成时态请问另外两种情况怎么处理,从句的发生时间在主句之后或者从句的发生时间和主句并列
• they often play chess after they have had supper从句为什么用完成时?
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• If the Houses of Parliament had not been burned down in 1834, the great clock would never have been erected.这句句子为什么从句用过去完成?不是不真实的逐句用would家动词原形,从句用过去时吗?为什么不是 If the Houses of Parliament was burned down in 1834, the great clock would be erected.
• They often play chess after they have had supper.这里 have had supper.怎么理解
• 英语 连词成句：1.the,received,that,him,very,I,is,yesterday,from,important ,letter2.play,supper,they,chess,after,had,they,have,often3.brown,quickly,man,how,in,walks,the4.so,John,he,hard,get,job,a,might,that,worked,good
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