Let's have a talk和They are having a conversation.为什么一个用have一个用having?

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• 一.which class / school are you in?为什么要加In二.-（ ）-Yes ,Thank you.1.I see your dogs.2.Your passport is there.3.look after your passport.4.It's your passport.三.in the wall,on the wall 有什么区别?各举一个例子四.It's a new pencil.it look ( )yours.1.like 2.the same 五.-How many pictures are there on the wall?-( ),They are three1.Let me ask 2.let me see 3.let me count them六.put away 是“把东西放回原位”的意思吗?可以翻译成“把.七.Mr.and Mrs.Black ( )a big house.1.have 2.has Mr.and Mrs.Black 可以用
• 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。
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