bear的过去式过去分词？

例句

We followed the bear's tracks in the snow.

我们跟着熊在雪地上留下的足迹走。

The little boy cuddled the teddy bear close.

小男孩紧紧地搂着玩具熊。

You people without kids don't know you're born.

你们没孩子，真是身在福中不知福啊。

Pressure was brought to bear on us to finish the work on time.

我们得按时完成工作，没有回旋余地。

The pain was almost more than he could bear.

这种痛苦几乎使他无法忍受。