I have a 2000 ford Taurus station and can't put it into gear.why can't I put it into gear?

I have a 2000 ford Taurus station and can't put it into gear. Why can't I put it into gear?

Push the brake pedal

It could be the brake switch but, try this: set the parking brake, put the key in the ignition and and turn it to the first position; that's where you can use the accessories but the engine is not running.

Push the brake pedal and shift the driver selector into "N". Start the car. Keep your foot on the brake pedal just in case you have a bad parking brake.

Release the parking brake and shift the drive selector to the desired gear, "R" or "D".

The brake switch is easily replaced and cheap. I had a late 90's/ early 2000's Taurus that did this on occasion, even after replacing the switch.