Конкретизируйте схему «субстрат – фермент – продукты реакции» на примере опыта по разложению ферментом каталазой пероксида водорода. Допишите утверждения

I am doing my homework now. 
We are having breakfast.
He is riding a bicycle/
She is reading a book.
They are cooking

1. My sister is doing homework at the moment, but unfortunately I haven't enough time to help her.(at the moment)
2. I am looking for my glasses, haven't you seen them? (now)
3. Mum is cooking dinner, we are waiting for the guests. (now)
4. "You are always being late!" - teacher said. (annoying situation)
5. I am leaving tomorrow. (nearest future, plans)