Mostautisticpeople (though by no means all) do have the ability to talk.
Most of the time, though, autistic people speak differently than their neurotypical peers.
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What Is a Pragmatic Speech Delay?

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A pragmatic speech delay is also known as a social communication disorder.
It refers to the ability to use speech for social purposes.
Improvements in pragmatic speech skills can make a huge positive difference in others' response to autistic people.
American Speech-Language-Hearing Association.Social Language Use (Pragmatics).
2016 Aug;46(8):2821-2829. doi:10.1007/s10803-016-2814-5
Hwa-Froelich DA, ed.Social Communication Development and Disorders.
Psychology Press; 2014. doi:10.4324/9781315735627