as easily and openly as once they could 对这句话有点疑问?

as easily and openly as once they could 对这句话有点疑问?原话是这样What has happened is that people cannot confess fully to their dreams,as easily and openly as once they could,最后的could后面是个逗号,后面还接有一段话的1.as easily and openly as once they could 这段话是从句吗,如果不是从句,是什么?2.once they could 为什么把once放在前面,而不是 as ……as they once could 或者 as ……as they could once 还有另外一个例句My memory isn't as good as it once was这句话中once为什么就放在了 it 和was中间，而不是放在前面 once it was