How safe is it to drive a car with a seriously rusted sub frame/frame?

I have a 2003 ford focus. I recently brought it in because my power steering fluid was leaking. When the guy called me back he told me my sub frame was extremely rusted, so is my frame. This all happen the first day I started my new job in which i need to drive 20mins to get too. So my question is how safe is it to drive a car that has a rotted sub frame? This new job is only 1 or 2 days a week. I attached some pictures that I tried to take from under my car.

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