It's grammatically correct, but native speakers wouldn't say that. - Grammatically, it's correct, but native speakers wouldn't say something like that.
It's grammatically correct, but native speakers wouldn't say that.
Grammatically, it's correct, but native speakers wouldn't say something like that.
This sentence is grammatically correct. - This is a grammatically correct sentence.
This sentence is grammatically correct.
This is a grammatically correct sentence.