'Sit on your left' or 'sit to your left' or 'sit on to your left' etc [closed]

Question

Which one of the following is correct. There are pairs of chairs in a classroom and one wish to say that students should sit in the left-hand side chair, leaving the right-hand side chair empty.

• 'Sit on your left'
• 'Sit to your left'
• 'sit on to your left'
• 'sit at your left'
• any other phrase

At some logical plane, one can never sit on one's left hand side because as soon as he sits on his LHS, his LHS changes.

Answer 1

The way you say it in your explanation sounds to me to be the best. I.E.

Sit in the left-hand chairs and leave the right-hand chairs empty.

Answer 2

The idiomatic phrase which uses four words is

Sit on the left,

but "Sit in the left-hand chair at each desk" is clearer. As you say, using "your left" is unlikely, if only because the children or the teacher may be facing the desks from the front (when each desk's left-hand chair would be on their right).