20 ways to stop your students translating
20. Put them through brain surgery and cut the nerves involved in translation
19. Put them through brain surgery and cut out the part of the brain used in speaking L1
18. Apply an electric shock every time they translate
17. Shout at them, and preferably make them cry, every time they translate
16. Make them ashamed of their own language
Or alternatively, try one of the 15 more sensible tips I have saved for the more sensible parts of TEFL.net: