Употребите вопросительную и отрицательную форму
The shops are closed today.
Kate is at home now.
Our students are very good.
I rene helps her mother.
It takes me hals an hour get to my work

the shops aren't closed today.Kate isn't at home now.our students aren't very good.Rene doesn't help her mother.it doesn't take me hals an hour get to my work.