请教几个英语句型,
问题描述：
请教几个英语句型,
1 she will be a middle school student
2he lives in Beijing
3they must study at home
4 show me your new ruler
5our teacher asks us to help other
6we are doing our homework
7there are some policewomen the street
8there is a big tree behind the house
请告诉我这些都是什么句型.
就是，主谓宾句型，主系表句型，主谓双宾,主谓句型，主谓宾宾补句型，上面这些都分别是这几种句型中的什么句型？
答
1 主系表
23 主谓
4 主谓双宾
5 主谓宾宾补
6 主谓宾
78 there be 句型