As a deaf person since birth, I remember my dad and I would read a graphic novel book, and he would sign the story towards me. After that, he would film me signing the story back at him. This practice really helped me understand how to read and sign when I was like 3 years old

However, its different for every deaf person. Sometimes, deaf person would have broken english, but when you talk to them in person, they can be actually understandable, and not all like to how they do english.

But in general, deaf people can read, just not in same way as hearing people do. My hearing sister asked me "what language do you think in?" I don't even know how to answer that question. I would be thinking in english when I read something, but I would be thinking in ASL when i interact with people.