kolokoy There are only two places for teen drivers to go if they are not careful in driving The subject-verb agreement is correct, check. The plural and singular nouns are correct, check. No, grammatical problems, check.
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kolokoyThere are only two places for teen drivers to go if they are not careful in drivingThe subject-verb agreement is correct, check.
kolokoyif they are not careful in drivingIt would be more natural to say if they do not drive carefully. Also, you need an article before cemetery.
MeathawkEverything is correct.The only problem with that is that There are only two places for teen drivers to go if they are not careful in driving: jail and cemetery does not sound very natural. I'd be more likely to say: