i am doing homework.
are you doing your homework/
i am not doing my homework
i am having a shower
are you having a shower
i am not having a shower
you are smoking
are you smoking
you aren't smoking
you are drinking在帮忙找十个 谢谢you are playing gamesare you playing gamesyou aren't playing gameshe is singingis he singinghe isn't singingshe is dancingis she dancingshe isn't dancingyou aren't drinking