I start by writing four statements on the blackboard that use a grammar point they've learned lately. For example:
- I practiced guitar yesterday.
- I went to Tokyo last month.
- I saw a movie two weeks ago.
- I didn't eat dinner last night.
Next I tell the students "Three are true, and one is false." Usually I find I need to confirm that the students are certain what the meaning of "true" and "false" are. Then I ask the students "Which is false?" and take a survey by a show of hands for each statement. When I reveal the answer, I draw a big "X" next to it. Next it's the students' turn to write three true statements and one false statement about themselves.
Once they're finished writing, the students quiz each other in pairs by reading the four statements and asking the other student to guess which is false. Then they write their partner's name in the "Yes" section if their partner guessed correctly, or in the "No" section if their partner guessed the wrong number.
I'd recommend changing the example sentences in the file to match whichever grammar point you want to review!