过去时表示过去发生的动作或状态，有以下三种形式:简单过去时:表示过去某个时间发生的动作，构成方式为“主语+动词过去式”，例如:“I went to Beijing last week.” “She played the piano when she was young.”
While running regularly can’t make you live forever， the review says it __ more effective at lengthening life than walking， cycling or swimming.
