用before或after连接过去的两个句子时,before 和after各用什么时态

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• after having taken off,the plane flew low over the cityafter having taken off,the plane flew low over the city.1整个句子是个什么句子或句型?2句中的after having taken off,take为什么用过去分词?我个人乱说哦：）别介意哦 就是用过去分词taken话那having就应该用have了构成一个现在完成时的句子.3如果having算动名词的话那taken应该是用原形take吧?备注：要说一下句子是正确的,新概念的,当然,上面问题2和问题3我认为的认为肯定是不对的.我们进入焦点，一楼朋友说是此句一个现在完成时态，三楼朋友说是过去完成时，我们在讨论一下。
• __before we leave the day after tomorrow,we should have a wonderful party答案是were they to arrive 还有 Had they arrived Were they arriving Would they arrive一点这个倒装句的助词提前为什么是were是过去式 ,不是原形are 不是had或 did二点 to arrive arrived ariving arrive分别在什么情况下用
• 关于过去时和完成时的区别He (gazed at) the display for several minutes before re-entering his shop.括号内的为什么不能用 have gazed at.后面有before 说明 gazed at在re-entering 之前发生 这种情况（包括after）到底前后两句应该用什么时态.
• 英语句型和英语时态的问题 Mary and my brother are to be married next year.   玛丽和我的兄弟计划明年结婚.这个句子能不能写成 Mary plan to marry my brother next year  或Mary is going to (这里换成will合适不合适) marry my brother next year如果按照例句的写法, 玛丽和我的兄弟去年就结婚了  Mary and my brother were married last year.  玛丽和我的兄弟今天结婚      Mary and my brother are married today.无论时间怎么变,按照例句的写法感觉都要写成married,不对的话这两句话怎么写另外上次的句子我还不完全理解：They often play chess after they have had supper下面这句话怎么写,用上面的例句模板写用after,before连接的句型：
• 用before或after连接过去的两个句子时,before 和after各用什么时态
• 用before或after连接过去的两个句子时,before 和after各用什么时态
• 请告诉我一下after和before的用法,后面接的东西和时态,
• before after 能否跟完成时态如题：1、之前上课的时候老师说到before after不能跟完成时,他说的是主句不跟完成时还是从句不跟完成时?我的造句：①He has finished his homework before he went to bed.②He fininshed his homework before he had went to bed.③He finished his homework before he has gone to bed.④He had finished his home work before he went to bed.请分开点评,从时态的平行到用法.2、另外before在做修饰的时候也遵循上面规律么?例句：①He has done his homework before.②He did his homework before.③Tom has never before been isolated from his friend.求点评.