Помогите срочно пожалуйста!!!

Вставьте глагол to be в форме Present, Past, или Future Simple. Where … your brother now? – He … in his room. ……. she….. at work tomorrow? – Yes, she ….. ………. you at school yesterday? – Yes, I …. My sister …. at school now. She … not at home. We … pupils last year, but now we …. students.