"has grown" vs. "is grown"

[W]

Hello there, thanks for viewing this post.

I saw this sentence in a book, "He is grown very forgetful..."

I wonder if that means the same as "He has grown very forgetful..."

Thanks.

[Beeesneees]

Yes, it says the same thing though it uses a different verb,

The 'he is' variant isn't used as often and sounds slightly old-fashioned.
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[W]

Ha-ha....yes, it is a sentence from a really old book.

So I often hear people say "I am worried about...", and this also means the same as "I have worried about..."?

[Alan]

Hi W,

That is a different construction. 'He is grown' is an archaic form and derived from the use of the verb 'be' as the auxiliary in place of 'has/have' to make the perfect tense as happened in German (and still does) when using verbs indicating change.

Alan
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[W]

Wow, Alan, you study Germany as well?

I am thankful to both of your explanations. They really cut the Gordian knot which had troubled me for long.