“Home” or “at Home?”

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Oct 17th 2011 11:13 expression question english
The word “home” is sometimes a noun, sometimes an adverb, and even an adjective.

I often have trouble finding out which to use, “home” or “at home.”
I’ll try to write some examples now.
I would be glad if you correct me or give me some advice about them.

#1 I’ll be home in a few minutes.

#2 I’m home!

#3 Are you at home now?

#4 I stayed at home all day yesterday.

#5 I feel like staying home rather than going out.

#6 I usually have lunch at home.