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I am wondering if we can use present continuous in the “main clause”? And if so, yes why?
Example:
If you do that again, I am killing you.
The right way to say it is:
If you do that again, I will kill you.
And the second question concerns the “if clause” plus “to be going to". According to the rules, it is wrong to use it one after another, but many native speakers use it that way, I would like to know why.
Example:
I can play with you if you're going to hear me.
In comments you speak of "rules of first conditional". You should be aware these are not actual rules, more guidelines.
Aside: Children are not taught about first, second, third conditionals in school in native English speaking countries. These are a simplification which was designed to explain to learners that the past tense in conditionals doesn't always refer to past time. The actual grammar of conditionals is more complex, and much more flexible
It is quite acceptable to use "I am killing you" in the main clause of a conditional sentence. In contrast to "I will kill you" it suggests a direct and unavoidable consequence, rather than a promise or prediction.
