They often play chess after they have had supper.这里 have had

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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

这里是强调两个动作的先后关系,即吃完了晚饭后再下棋.
由于是描述习惯或经常是这样做,因此分别用了现在时和现在完成时.
再问：这里是不是吃晚饭对下棋产生影响的

另外下面两个句子怎么翻译

1.他们经常在吃晚饭前要先下一盘棋。(还有chess是不可数名词，这里的一盘棋怎么处理)

2.他们经常是一边吃饭一边下棋的。
再答： They often play a game of chess before they have had supper.
They often play chess while having supper.

They often play chess after they have had supper.这里 have had they often play chess after they have had supper they often had a walk after supper 找出They have had supper before we arrived here.中的错误 they have just had some sandwiches . They have had the problem solved. they have had the problem solved Have they had any tea or milk? they often paly__ chess after school we've had our dinner;have they had they often have supper at home.改成一般疑问句 Do they have a short rest after supper是什么意思