5. He (not do) his homework.

В данном задании необходимо поставить глагол, данный в скобках, в форму Present Continuous.
Вспомогательный глагол to be в форме Present Continuous для подлежащего He – is.
Глагол do в форме Present Continuous – doing.
Отрицательная форма глагола to be – not.
Предложение в Present Continuous: He is not doing his homework.

Ответ: He is not doing his homework.