Ⅰ. at times “不时;偶尔”如：
① The tide is , at times, very high. 潮水有时涨得高。
② I make mistakes at times when I speak English. 我说英语偶尔会出错。
Ⅱ. at all times.“随时;任何时候;总是” 如：
He has a cool head at all times. 他随时都有清醒的头脑。
Ⅲ. all the time “一直;始终” 其中time用单数形式。如：
The baby cries all the time. 那婴儿一直哭。