'If you were a sailboat' by Katie Melua is a perfect song to practise 2nd conditional. Print out the worksheet and fold it along the lines, so that your students can focus only on the first part of the song. In this part students fill in the gaps using the verbs in brackets for controlled practice. Play the first part of the song and let the students check their answers. Then ask students to predict the ending part of each verse and write their guesses in the (g) gaps. Listen to the song to check if their predictions were right - students write the correct answers in the (a) gaps. Have fun predicting with the remaining parts of the song.