(And other things English teachers get wrong)
I’m hoping the pitchforks haven’t come out already, just because of that title (or perhaps that subtitle). I’m also hoping that most of you know why that statement is incorrect.
It’s true that a sentence needs a subject and a verb, BUT what most teachers forget (or never knew in the first place) is that the subject might not be overt. It could be understood, as with “HALT!” The implication is that you or someone else is to halt.
That doesn’t make “HALT!” any less of a sentence than “HALT, YOU!” or “HALT, THIEF!” Those last two are just inverted syntax, with the subject of the verb coming after it instead of up front.
Utterances like “Ugh!” and “Oh my God!” aren’t sentences, grammatically speaking; they’re, well, utterances. They’re spoken. They have meaning, but it’s based on context, on the words and circumstances surrounding them.
So once more, with feeling: Every sentence needs a subject and a verb. (Not necessarily “two words.”)