How can you communicate if you can't see or hear?

Answer 1

If your hearing and sound have been lost later in life, and you already have the basic alphabet and that in your head, you could maybe learn to read braille, and you should still be able to write stuff down. The other senses will obviously be much more important than they normally would have been, and as such may become more sensitive. Someone writing letters on the palm of your hand, for example, may be a source of input. Output, nodding or shaking your head for yes or no, writing down your thoughts, or even blinking! Research "The Diving bell and the butterfly"

Answer 2

Communication can still occur through tactile methods like Braille or tactile sign language for those who cannot see, and through tactile or visual methods like writing, typing, or using sign language for those who cannot hear. There are also assistive technologies available such as text-to-speech or speech-to-text devices that can facilitate communication.