If you want to answer my questions, put up your hands....(one question)..(A boy answers the question, but not in a complete form
....) 1. Try to answer the question in a full sentence/form.
2. You should answer the question in full sentences/forms.
3. Answer the question in a complete sentence/form.
4. Will you answer the question in complete sentences/forms?
================== Which expressions are suitable in the situation?