light的副词形式是什么

　　This is not a problem we should take lightly.

　　这个问题我们可不能掉以轻心。

　　They let us off lightly.

　　他们放过了我们。

　　These threats are not to be taken lightly.

　　这些威胁可不能等闲视之。

　　She tended to sleep lightly nowadays.

　　她如今睡觉容易惊醒。

　　It began to snow lightly.

　　开始下小雪了。