How long have you eaten natto?
I have eaten natto for 3 years.
I have never eaten natto.
Practice
Print a full set of cards for each group and make sure there is a patten on the back so the students can’t see through them.
Prepare some fake money or tokens so the students can keep track of the score.
Each student takes it in turns to draw a card and make a question using the target language. He can ask anyone else in the group the question.
If the student answers: I have….. for 3 years, the student who asked the questions gets 3 dollars.
If the answer is: I have never….. the student gets no dollars.
The limit is 5. So if a student answers; I have …. for 15 years, the student only gets 5 dollars.