That's correct. But neither can you think in sentences in that case, unless your relationships are just calculated means to an end. Whether you want to continue a relationship is not a conclusion of a sentence, but something you know without words, just like you know without words whether you want to eat the dish that's on your plate.
But what's more interesting is that through talking with others we've discovered one interesting thing about what it's like for other people to hear a voice in their heads:
In most people's dreams, when someone talks, they can hear the voice, which has a specific pitch, rasp, etc. For me and my friend, in our dreams we can never characterize the voice. We just become aware of the sentence spoken and the time passed (even though in a way it feels immediate), but if we focus, it's clear that we cannot recall any sensation of hearing a voice in any way. It blew our minds off when we realized that other people's dreams are different in such a way.
I can think of sentences. But they are not spoken in my head. There is no voice, which would be male or female etc. And I only do that when the sentences are the goal. They are not the means.
I’m not sure that this is true. I think in terms of my dreams they are closer to what you describe as your experience; mostly visual, with speech something that’s more often understood than heard. I imagine most people have something similar, and not so analogous to real life.
I do have an inner monologue in my waking hours though, and it’s very interesting to think about what it would be like to not have one!
Then I noticed that I don't think with my internal voice when coding. I'm still thinking but not with sounds in my head. That blew my mind and made it easier for me to understand other's internal experience.
I wonder if people who rarely have an internal voice are less interested in things like podcasts, where the information in conveyed aurally.