Step 1: Recall the definition.
Imperative sentences are those which express commands, instructions, advice, or requests. They usually begin with the base form of the verb and have an implied subject “you.”
Step 2: Apply to the sentence.
In the given sentence, “Get out” and “wait in the yard” are direct commands. The subject “you” is understood (implied), but not mentioned explicitly.
Step 3: Conclusion.
Since the sentence issues an instruction, it is classified as an imperative sentence.