I think it must be teenagers having fun.这句话的句子结构是怎样的
问题描述：
I think it must be teenagers having fun.这句话的句子结构是怎样的
答
think 后加it 引导的宾语从句 it在从句中做形式主语 正常语序是：teenagers must be having fun.我认为那些年轻人一定玩儿得很开心