补充一下
i used not to have much homework to do and take study as a piece of cake.but now i have a lot of homework to do and that makes me stressful.
i used to attend activities i like after school,but now i have to study so long,even staying up all night,that i have to give up my own hobbies.
i used to spend time with my families and friends in the weekend.but now i have to take classes at that time.