It's basically an incomplete sentence, like:
Hello I am. a magician.
Do you mean sentence fragment? The question is not quite clear. If that's what you mean a sentence fragment is an incomplete sentence.Example: Running down the hill.
Do you work? is a complete sentence; it is not a sentence fragment.
"She wave." is fragment but "She waves" is a sentence.
fragment
Fragment.
sentence fragment
It is a sentence fragment
is a sentence fragment
"After the storm," is not a complete sentence so it is a fragment.
Make each fragment into a complete sentence.
It's a sentence fragment and it means, "we're in the ...."
A fragment sentence is a partial sentence. It does not have everything it needs to be a full sentence. For example: "The dog" is a fragment.