Please, which of the two is grammatically correct? Thanks.

I think the implication in the expression "I'm home" is that you're home from somewhere. It ma be that you've just come/gone in, but it doesn't need to be — you can be home from the front or home from university and have been back for a week or so. But a homecoming in the not-too-distant past is certainly connoted.

The nature of the word home in "come/go home" is often argued over; noun and adverb are suggestions, but directional particle is what I'm voting for at the moment. Apparently, home in go home can be used without a preposition because it is the remnant of an earlier form that fused preposition (to) and noun, and when this type of inflection for case disappeared from English, this particular usage continued, with the to-home form standardising with the base noun. We don't have "I'm going school". Possibly, "He is home" has arrived via "He has/is come to-home". Home in "He is home" is locative rather than directional now.

It may be another legacy from the fused to-home that we never use the preposition to with home (except with an intervening determiner etc.), but this is true for other nouns also.

Certainly, other prepositions (at, from) can be used with the noun home in the expected way, and "I'm at home" is strictly locative. To express arrivals at other venues, we are forced to use a different expression — "I've just got to school / I've arrived at school"'m home" is what you say when you walk in through the door to tell people there that you've arrived.

"I'm at home" is what you say when someone asks you on your cell phone or IM where you are locate. "Where are you?" "I'm at home right now."

Karmanaut:
I think the implication in the expression "I'm home" is that you're home from somewhere. It ma be that you've just come/gone in, but it doesn't need to be — you can be home from the front or home from university and have been back for a week or so. But a homecoming in the not-too-distant past is certainly connoted.

The nature of the word home in "come/go home" is often argued over; noun and adverb are suggestions, but directional particle is what I'm voting for at the moment. Apparently, home in go home can be used without a preposition because it is the remnant of an earlier form that fused preposition (to) and noun, and when this type of inflection for case disappeared from English, this particular usage continued, with the to-home form standardising with the base noun. We don't have "I'm going school". Possibly, "He is home" has arrived via "He has/is come to-home". Home in "He is home" is locative rather than directional now.

It may be another legacy from the fused to-home that we never use the preposition to with home (except with an intervening determiner etc.), but this is true for other nouns also.

Certainly, other prepositions (at, from) can be used with the noun home in the expected way, and "I'm at home" is strictly locative. To express arrivals at other venues, we are forced to use a different expression — "I've just got to school / I've arrived at school"'m home" is what you say when you walk in through the door to tell people there that you've arrived.

"I'm at home" is what you say when someone asks you on your cell phone or IM where you are locate. "Where are you?" "I'm at home right now."

very insightful. Suddenly, people regard " I am at home” as an outright grammatical blunder and this has kept me thinking why a hitertho correct English suddenly turned to a grammatical blunder.

2rutalk1:
very insightful. Suddenly, people regard " I am at home” as an outright grammatical blunder and this has kept me thinking why a hitertho correct English suddenly turned to a grammatical blunder.

Personally I avoid the pitfalls of the English language by switching to pidgin when I'm confused.

Karmanaut:

Personally I avoid the pitfalls of the English language by switching to pidgin when I'm confused.

Lmao. I simplify it for myself by saying it in another way

I am at home

I walk into the house from the supermarket: 'Hello everybody, I am home.
Later in the day, I'm on the phone talking to my boo and he asks.... 'where are you bae? 'I am at home love' will be my reply. Do you get it?

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This two different world and meaning. I am home: i just reach home i am at home : i dey house i guess u understand. Both are correct it just depend on what saying at the moment