"Having conversations with friends was not helpful at all"中主语是什么,改为同义句（两个）

Having conversation with friends is useful . conversation conversation conversation conversation conversation having conversation with friends helps a little,having为什么不是to have think后面加动名词,为什么如这道题;I think _______(have conversation)with friend is helpful.正确答案为having conversation为什么? Let's have a talk和They are having a conversation.为什么一个用have一个用having? have为什么在后面是ing形式he added that having conversation with friends was helpful they are having a conversation 这句怎么翻译,里面有什么语法点 Look!Miss li t____ with her students is having an English conversation.首字 Look!Miss li t____ with her students is having an English conversation.首字母填空 _in the conversation,they didn`t notice me entering the room.A.EngagedC.Engaged themselvesD.Having engaged themselves 请翻译 I had a conversation with Malaysia's Office just now because having some contract issues so He introduced himself,___ to enter into conversation with them.A hopingB to hopeC hopedD having hoped You are not take part in a family conversation or having a t___ with friends根据首字母填词 conversation造句