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When Fred first met his German hosts, he shook hands firmly, greeted everyone in German, and even remembered to bow the head slightly as is the German custom.


Q1 : What is the function of 'as' ? Conjunction? Pseudo-relative pronoun?

Q2 : I'd like to know the sentence structure after 'as' (= is the German custom) Is this inversion?

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It could be an adverb since it means "like" as an adverbial preposition. You can substitute "the way" for "as," and that is adverbial also.

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HoonyQ1 : What is the function of 'as' ? Conjunction? Pseudo-relative pronoun?

I'd say your interpretation "pseudo-relative pronoun" is pretty good because "as" acts like "which".

... to bow the head slightly, which is the German custom.

HoonyQ2 : I'd like to know the sentence structure after 'as' (= is the German custom) Is this inversion?

Under that interpretation there is no inversion because "which"="as" is the subject, and of course "is" is the verb.


Merriam-Webster has a definition of "as" as pronoun, thus:

as (pronoun): a fact that
Ex: is a foreigner, as is evident from his accent

Personally, I think a definition of simply "which" would have said the same thing.

CJ