There is not such a thing "short format" in the MLA guidelines for style. Your teacher might be referring to the way you punctuate titles of short fiction, or perhaps he or she is instructing you that the short answers you provide must be formatted using MLA rules. I am not able to determine based on the information you gave, but I will give you the basics of MLA formatting and some links that should be helpful.
When submitting any paper in MLA format, your information should be typed, double-spaced, using 12 pt. Times New Roman or similar font, and using 1 inch margins on all sides. In the upper left hand corner of the first page, be sure to have your name, your instructor's name, the name of the course and the date. Again, be sure to double-space. Double space again after this and put a title, centered. Double space again and begin your work.
On every page, there should be a header in the upper right hand corner, justified to the right margin, and 1/2 inch from the top of the paper. The header should be your last name and the page number, in that order.
Be sure to use proper punctuation for all titles referred to in your paper. If it is a book, movie title, etc., then you should use either underlining or italics - be consistent with whichever one you choose. If it is a song, poem, chapter in a book, etc., then you should use quotations mark.
Use parenthetical citations for any information obtained from another source, and be sure to include a works cited page.
The links below give you much more detail about the process. Use them to guide you.