Grammar Collection - Zero Out
Using the Zero Conditional should be fairly easy, but students do struggle (often confusing it with examples of the First Conditional).
Zero Out is a great activity to help them practice. Give each student, or group, a sheet and have them write ten complete sentences about the words on the left of the page, using the Zero Conditional.
Then have them swap sheets and peer mark each others work. For every sentence they get wrong (there will be debate on this one, so be prepared) they get a point). The team with zero points at the end, wins!