Step 1: ECHO the question. Use words from the original question in the first sentence of the answer. This helps to organize the response and to ensure that the response is both a complete sentence AND really answering the question.
NEXT: A-C-E. This means "Answer, Cite evidence, and Explain the evidence." The "echo" and the "answer" can all be part of the first sentence. Citing evidence is simply explaining why you think what you think or how you know what you know. The last step, explaining the evidence, is where the writer connects the evidence to the answer ... how that evidence fit?
So - now you know how to ACE your short answer responses!