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大多数现在分词和许多过去分词都可以作形容词用。以-ed 结尾的形容词常与人称主语连用，表示人的情绪、状态、喜好等；以-ing 结尾的形容词则常与非人称主语连用，表明事物的某种特征、性质等。
| it’s = it is它是 | Its 它的 |
|---|---|
| It's (= it is) cold today. It's raining too. 今天天气冷. 而且正在下雨 | This engine has lost its power. 这台发动机已失去了动力 |
| realize vt. 意识到… | understand vt. 明白… |
| He didn't realize that he had made a mistake. 他没有意识到他犯了一个错误. | I don't understand English. 我不懂英语. |
| be interested in (doing) sth. 对…感兴趣 | interesting adj.有趣的 v.使感兴趣 |
| I am not really interested in fishing.(I’m interested in collecting stamps.) | Fishing is not interesting.钓鱼没什么意思。 |
| exciting adj.令人兴奋的 | excited adj.激动的，兴奋的 |
| The match was very exciting.比赛非常激动人心。 | The crowd got very excited.人群变得非常兴奋。 |