这些句子有语法错误吗？

what a great vacation it is!(或者how +形容词+主语+be）
i am staying at home do my homework and then i am talking in internet with others.

first 可以去掉 最好不要用现在进行时 网上聊天用 chant 不用talk about 而且 如果你用CHANT人家就知道你在和人说话 所以不用加对象了 你可以说

I stayed at home to do my homework and chated in Internet. what a great vacation it is.

what a great vacation it is! 这句对
i will stay at home and do my home work first.
i am talking with others on the internet.

1. What a great vocation it is!
2. I stayed at home doing my homework first.
3.I am chating with others on the Internet.

What a great vacation it is!
I will stay at home and do my home work first.
I am chatting with others in the internet.

what a great vacation it is! I stayed at home to do some homework and then do some others,such as having a online talk with other.