because I'm a computer
They can speak.
she cant
you cant
Dysphagia
mute
Well you cant really speak when you have lost your voice, but if you try to speak it will get worse.
say meow meow :P you cant actually speak cat
Incoherant.
because they cant speak English ;)
I cant
you cant
If someone is unable to speak, it's called being 'dumb'.