Sometimes I do have internal monologue (although I cannot actually hear it) and sometimes it isn't. And sometimes I don't know the words for what I think of. When reading English writing it is a kind of pronouncing, but if it is Chinese (or other ideographic kind of language) then it isn't. When thinking of my own stuff is again different from this. (English is the only language I can write/speak well; the others I am not so good at.)