形容词
1. He made it plain that he did not like me. 他很明白地说他不喜欢我。
2.
2. I must be plain with you. 我必须坦白地对你说。
3. The child has a plain face. 这孩子相貌平常。
4. She wore a plain brown dress. 她穿了一件普通的棕色衣服。
副词
1. She's just plain silly. 她简直傻透了。