17. at times / at all times / all the time
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。