Есть ли среди этих предложений Present simple? His achievements since his accident have shown him to be a real-life superman.

They\'ve already proved that it\'s possible for nerves in the spinal cords of animals to regrow and reconnect. IT IS (possible) - Present Simple.

At first, he couldn\'t breathe without a machine, but now he can breathe on his own.HE CAN (breathe) - Present Simple.