Answering can be real easy. The reason I put full sentences is for your practice. But remember when you really answer, you are not required to put them in full sentences. I'll try to mix it up so you get a familiar feel answering both long and short ways.
Learn English speaking much FASTER by downloading the TalkEnglish Offline Package and submerge yourself with over 8,000 audio files and over 800 pages of lessons! Then you can study without Internet connection and also listen to audio files using your MP3 player at any time. Go to the English Download page and download today!