catch的过去式和过去分词怎么写

　　例句：

　　I caught him just as he was leaving the building.

　　他正要离开大楼时，我追上了他。

　　An article in the newspaper caught my attention.

　　报上一篇文章引起了我的注意。

　　It's easy to get caught up in the social whirl.

　　很容易被纷繁的社交活动缠得脱不开身。

　　I caught a look of surprise on her face.

　　我发现她面露惊奇。