He saw the back of the car as it drove away.

He sees the back of the car.

I love seeing the back of a beautiful sunset.

I have finally seen the back of that difficult project.

I consider him as my back-friend.

I have many back-friends who always support me.

She is sitting back and enjoying the view.

She sits back and relaxes after a long day at work.

She sat back and relaxed on the beach.

She back-combed her hair for extra volume.