I didn't know they did that anymore.
Which verb is the adverb that "anymore" describing, the first "did" or "know" or the last one "did"?
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Sign up to join this communityI didn't know they did that anymore.
Which verb is the adverb that "anymore" describing, the first "did" or "know" or the last one "did"?
The second "did."
The first "did" is just an auxiliary for "know."
It's not that you don't know anymore. It's that you didn't know that it is still done.
A rule of thumb that is often broken in English is that an adverb usually modifies the verb that it is closest to in the sentence. This sentence happens to conform to that rule both grammatically and logically.
However, if the "closest to" rule creates nonsense, then go with whatever logic tells you. I suspect that English may not be the only language where the overriding skill humans use for understanding is logic rather than grammar.