I am not absolutely sure what your teacher is asking, but I think what s/he means is that you should draw the molecule as a
line structure. This is the term my organic chemistry book uses. This website calls it the
bond-line structure:
http://wwwphys.murdoch.edu.au/teachi...ic/organic.htm.
The idea is that the molecule is written as a bunch of lines connected at approximately 60 degree angles. Where the angles (or intersections) are in the diagram, carbons are in the molecule. Any atoms except carbon and hydrogen will be drawn in. Any carbons that have less than four bonds shown on the diagram have enough hydrogens bonded to them to make four bonds.
Take a look at the linked website.