Утвердительные:
They are reading books now.
They are read books every day.
Отрицательные:
They don't read every day.
They don't reading books now.
Вопросительные:
Who reading books now?
Who read books every day?
They reading books now?
They read books every day?
What they reading now?
What they read every day?
What they doing now?
What they do every day?
(в предложениях с "now" к глаголу добавляется "ing"-ое окончание)