Помогите решить по английскому яз. спасибо!

1. There are fifty states in the USA, are not there? Yes, are there. 2. The US capital was named after G. Washington, was not it? Yes, it was. 3. American nature is ver beautiful, is not it? Yes, it is.4. You need a lot of courage to cross the falls, do not you? Yes, I do.