用This+is造4个肯定句和4否定句？

Question

如题所述

Answer 1

This is a dog.这是一只狗。
This is a bird.这是一只鸟。
This is a big.这是一头猪。
This is a man.这是一个男人。
This isn't a dog.这不是一只狗。
This isn't a bird.这不是一只鸟。
This isn't a big.这不是一头猪。
This isn't a man.这不是一个男人。