You’re thinking in terms of location, rather than state-of-being. “I’m home” is your status.
“I’m driving, I am bored, I’m safe, I am away”… None of those sound weird, do they? This, combined with the more technical grammar rules others have commented…
Home is the adjective. It’s a state of being.
Many times I’ll walk in the door but need to log into work, and I’ll say to my wife “I’m not home yet”. As in, my external responsibilities are not completed and I am not available. When I’m available to my family or to relax, I have then become “home”.
Edit: I meant adverb. It modified the state of being. Like being “away”.
Hi, home! I’m dad.
It’s because “home” in this formation is an adverb, whereas school is a noun. You can be an adverb- I’m surprised, I’m exhuasted… - but you must be at a noun (or on, or in, or some other preposition).
You mean adjective, right? Adverb describes the verb, like talking “loudly” or “quietly”
This is the adverb form. If it were an adjective, it would be nearer to the noun and not seperated by the verb like in “He stole home plate.” “Home” is modifying the state of being or “am”.
with the addition that most languages - especially romance languages - have irregular verbs and constructions.
e.g. in french you say “I have 30 years” to say you are 30 years old. in English you say “I am 30” to say you are 30 years old. It makes no sense to say you are the number 30 or you have 30 years. But no one really thinks about it.
Home is used differently than house. I’m home makes sense. I’m house doesn’t (which is your school and post office equivalent).
It helps when you realize that home is an adverb in English.
