Hi,
Some time back, I asked a question on conditionals and I think CalifJim said something like there are many tenses in the English language and it is possible to use any combination in the if and main clauses. Only three has names but any combination is possible. How can we check for correctness??
 
I think no. 1 would be definitely wrong. Ithink it should be "If you used ..., I would tell your mother." But others look  very similar and I have an unable-to-explain-to-myself feeling that CalifJim might consider nos. 2-4 conditional and acceptable.

1.If you use a plastic spoon to hit your sister, I would tell your mother.
2. If you use a semicolon in the sentence again, I would point that out to your teacher.
3. If I use a plastic spoon to nudge your sister, would you tell that to your mother?
4. If I use a semicolon in the sentence again, would you point that out to my teacher?

See, I would have used a past tense in the if-clause to fit the second conditional model for all four like "If you used ..., I would ..." and dispense with the headache of having to think about their correctness; but afraid I might encounter them as a possibility in other people's writings and might find myself unable to figure out where they are coming from in terms of their conditional uses of the sentences.