The phone's ringing. Who's it for, I wonder?
Or:
I wonder what time the store opens.
There are some materials I have made acquaintance with: https://youtu.be/BdaQ55-JlPg https://grammarhow.com/i-was-wondering-vs-i-am-wondering-vs-i-wonder/
The problem that all these and some other resources do not explain anything. They just state a fact: use present simple here.
The girl in the video explains:
We use "I wonder" when we're thinking out loud. But as we're thinking out loud we don't always want an answer or expect an answer.
So, this is not an exmpalation. This is just stating a fact.
From grammar point of view I could suppose the following explanations.
- Performative verb. You ask yourself a question. And as you ask it, the action is finished.
- Stative verb.
- A single action going on at the moment of speaking and which is not viewed in its progress.
Could you help me understand this? I mean why definitely the present simple, but not present progressive is used to express a question when we are thinking out loud.
I'm absolutely confused about this case.