Lenka offers three ESL activities: RAM, Smart Dialogues, Grammar Quiz.
RAM stands for Repeat After Me. Lenka says a phrase and you say it again. If you don't say it naturally enough, you practice fluency and pronunciation. If you do, you move on to the Smart Dialogues. Lenka suggests a dialogue pattern, and you follow the pattern. If you do it with your eyes open you practice reading and grammar. If you do it with your eyes shut (which is not easy at all) you master listening, grammar, and speaking. The Grammar Quiz is pretty simple. You pick the grammatically correct sentences. As soon as you finish it you get your tiny little homework and the lesson is over. It takes about 4 minutes and starts from a simple phrase as "I like it too". It will cost you about $0.1 per lesson, but you have $1 credit to explore everything.