1. My mom asked me if I was busy.
-> Chuyển sang câu trần thuật nên lùi thì, chuyển " you " thành "I "
2. Before I came home late, my sisiter had prepared the dinner.
-> before + quá khứ đơn, quá khứ hoàn thành
3. Homeless people were given free temporary accomodation after the storm by the goverment.