None of the examples is correct, but the third one uses the right preposition ( from ). Assuming that your example is supposed to be a question, the correct form is as follows: How do I stop him from cheating again?
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AlpheccaStars How can we stop him from cheating again? This is the only correct sentence.'From' is not essential in British English.
fivejedjonHow can we stop him from cheating again? ...
'From' is not essential in British English.
Jacky56LinI don't know how to stop him from (not) coming tomorrow.I recommend that you stick to this pattern for stop, keep, and prevent.
notanativespeaker1notanativespeaker1Hello,