I agree with the previous answer especially for the children. For adults, I ask them in advance if they want to have homework, and I will cover it in class if they don't do it. Using a variety of activities including audio or video based homework is helpful from time to time as well

You can reduce homework while rewarding the student and encouraging them to do it Also, ask the parents, if possible, why he did not do his homework. You can make the beginning of each lesson a homework review.