There is any number of websites that show chords for left handed guitar playing. Also various tips, etc. The problem might be you seeing if the student's hand is in the correct position, since it will look a bit odd to you.

But a lot of people who are southpaws play the guitar "right handed" because if you plan to mostly strum and not do a lot of finger picking, your most dexterous hand will be the one doing the chording.