三、Read and judge. Ann 正在介绍她的家人。请你读一读，根据 Ann 的介绍，判断下列句子是（√）否（×）正确。
Hello, I'm Ann. This is my sister. She is a student. This is my brother. He is a student too. Both of them are students. But I'm a teacher. We are all in Yucai School. This is my mother. She is a doctor. This is my father. He is a doctor too. Both of them are doctors. They work in the same hospital(医院). This is my grandmother. She is a factory worker. This is my grandfather. He is a factory worker too. Both of them are factory workers. They work in the same factory.
()1. Ann's sister is a nurse.
()2. Ann's brother is a student.
()3. Ann is a student too.
()4. Ann's mother and father work in a hospital.
()5. Both Ann's grandmother and grandfather are doctors.

1.× 2.√ 3.× 4.√ 5.×

四、Check and say. 英语单词的构成形式有很多种，知道了单词的构成形式可以帮助我们提高记单词的效率。比如，一般情况下，有些表示动作的单词后面加上“er”或“or”，就可以表示执行这个动作的人，像sing(唱歌)→singer(歌手)，work(工作)→worker(工人)等。你知道还有哪些吗？请你查一查、说一说吧！

参考示例：
1. teach（教书）→ teacher（教师）
2. farm（务农）→ farmer（农民）
3. clean（打扫）→ cleaner（清洁工）
4. run（跑步）→ runner（跑步者）
5. write（写字）→ writer（作家）
6. dance（跳舞）→ dancer（舞者）

本题考查"动词后加er/or变为对应动作执行者"的基础构词规律，帮助同学们借助规律高效记单词，结合三年级已掌握的简单词汇，就可以找出大量符合该规则的单词。