Learn English – How to understand this “I not only” structure

grammar

I read this sentence from a book.

"I not only lost all my money – I also lost my passport".

Why it's not "I am not only.." or "I don't only..".
I don't know how to describe this kind of grammar, couldn't get much help from google.
Could you please explain this to me?
Thanks a lot.

Best Answer

That's a good question.

The answer, I think, is that not only acts as a unit. I can't think of another adverb which can take not in this way.*

The regular form I didn't only lose all my money is also possible.

*Constructions with not + adverb are common when there is no verb, as in "Do you always go that way?" "Not always"; or "He finished the job, but not quickly". But when there is a verb, the negative normally goes to the verb in the usually way "I don't always go that way"; "He didn't finish quickly".

Edit: I have thought of one more example: not infrequently. But neither often nor frequently works this way.

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