They will soon notice there is a problem with the lyrics. Ask them to correct the words that are not spelled correctly and check both meanings. They should find the two lines that are completely correct. Discuss the problematic words.
If it is appropriate, turn students’ attention to how the phrase “used to” is used here. Noticing is an important part of second language acquisition. If you are interested in more read this.
Line 6 and 22 are completely correct, all others need corrections.