Target: Young learners
Grammatical structure: comparative forms of adjectives (there are only 6 adjectives used SMALL, BIG, LIGHT, HEAVY, SHORT, LONG).
There are images of animals being compared provided. Ss have to choose correct adjectives in ( their comparative forms) to make sentences true. The fun part is, you end up with a password (MAMMALS) which at this level should be a new word to your students.