Emily and Wendy are twin sisters.I am good at English.My school is very clean.

1. Are Emily and Wendytwin sisters?
----Yes, they are.
-----No, they are not.
2. Are you good at English?
----Yes, I am.
----No, I am not.
3. Is your school very clean?
-----Yes, it is.
-----No, it is not.第二个再顺便回答个否定句ok?再多加5分！有否定啊是单独的，是否定句，不是一般疑问句的否定回答I am not good at English.这样吗？