A man pushing a hand-truck of boxes is bending over to pick up a pear.
A man is pushing a pear and picking up boxes.
The man is either pushing boxes and picking up a pear, or he is picking up boxes and pushing a pear.
A man is either pushing boxes and picking up a pear, or is pushing a pear and picking up boxes. Both cannot be done at the same time.
He is either pushing the pear or the boxes.