This worksheet serves as further practise of the sound /i:/. It is good to work with the sound previosuly in class and to use this sheet as a post-task activity and for students to keep track of every sound studied in class in their notebooks. In order for them to complete the suggested work you need to teach the possible spellings for that sound. The two indicates it´s the second sound I´ve worked on, you can do the same and attribute a sound to each unit.