Write five words about you related to your past, present or future—E.g. Kenya, salsa, red, travel, four.
Then others will ask you yes/no questions to find out what these words are about. And you can only reply a YES or NO.
For example, if you ask me- Do you want to go to Kenya? And that is not about my future; I will say NO. Next, you ask me- have you been to Kenya? I reply, YES. Then you have found the answer to the word Kenya.
Next, ask about all the other words, in the same way, to find out information about your classmates. E.g. you ask- Is red your favourite colour? I say, YES!
Later you can tell what you remember about each person.
In this exercise, the students not only learn to ask grammatically correct questions but also learn new information about each other.