An engaging ESL activity.
(1) Students try to solve the riddle individually.
(2) A short building is a short letter (e.g. a), a tall building is a tall letter (e.g. k). Let children think and write their ideas down.
(3) Check their answers in a teacher fronted way.
(4) Students draw skyscrapers in their notebooks and come up with their own riddles.
(5) Students work in pairs and try to solve riddles of their partners.