nkspb I will write a book at 4 o'clock. It's not possible to write a book at a specific time. Writing a book takes a lot of time.
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nkspbI will write a book at 4 o'clock.It's not possible to write a book at a specific time. Writing a book takes a lot of time. Therefore, the sentence has no real meaning, and it doesn't imply anything. If you say it, people will think you made a mistake in your choice of words.
nkspb"I'll do my homework at 2pm" - they will start doing it at that time.Yes. The more precise phrasing is "I'll start (to do) my homework at 2 pm", but what you have means the same thing. You can do your homework in one session, but not a whole book. That's why we treat those two situations differently with respect to the use of a definite time (2 pm, 4