Можете написать предложения сначала в Present Continuous, потом Present Simple в положительной отрицательной и вопросительной форме
Не совсем понятно, какой класс. P.C + I am doing my homework now. - I am not doing my homework now. ? Am I doing my homework now? P.S. + He always does his homework. - He always doesn't his homework. ? Does he always his homework?