Most adults who are learning a second language would disagre
Most adults who are learning a second language would disagree with this statement.For them ,learning a language is a very difficult task.第二句话的For them,FOR有介词和连词两种词性,这里应该是当连词用吧,起连接两句话的作用,我不是很确定这样理解是不是对的.如果改成 because 的话句子该改成什么样?为什么这样改?