It is a listening quiz, I use it to teach vocabulary and the simple present tense. I like this song because Taylor Swift is a very popular singer, she sings not too fast and students can hear the pronunciation and also repeat a series of new words. I teach the song for 2 or 3 weeks, the first day students need to find a series of words from the song, find them and write the meaning in Spanish, then we sing many times. The day of the evaluation, every student has one worksheet and I play the song several times, some of them get the words since the first time, sometimes it is hard for a group, but in general they like this activity.