become后面接形容词或者名词，例如：become adult（名词）；become strong（形容词）。例句：The weather became warmer（天气变得暖和起来）。

became后加过去分词例句：They had just become engaged（他们刚刚订婚）。At last the truth became known to us（我们终于知道了真相）。The room soon became crowded（房间很快变得拥挤起来）。