练习：将下列句子变成否定句1. I am a teacher. I a teacher.2. We are students. We students.3. Jane is a girl. Jane a girl.4. They like English. They like Chinese5. I come from China. I come from China.6. He likes Chinese. He like Chinese.7. Maria comes from Cuba. Maria come from Cuba.8. We know Maria. We know Maria.练习:将下列句子变成一般疑问句1. I am
