各单元语法练习题一、用be 动词填空。1、I _helpful .2、He _a good student .3、It _small .4、We _friends .5、What _Chen Jie like ?6、You _a teacher. 7、They _cars. 8、This _ my brother.9、I _ a boy. _you a boy? No, I _ not. 10、 Mike and Liu Tao _ at school. 二、写出下列单词的复数。1、sandwich_2、tomato_3、people_4、onion_5、dress_6、box_7、c