"The ECB has said it would continue buying bonds at least until September and keep rates low well after to raise inflation to its two percent target." (Reuters.)
Is "after" a postposition [i.e., would keep rates low well after (September)] or is it an adverb modifying the adverb phrase "low well" in the sentence above?
Think of the sentence this way. . [ and keep rates low] [ well after September ] [ in order to raise inflation to its two percent target ].
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Think of the sentence this way.
. . . [ and keep rates low] [ well after September ] [ in order to raise inflation to its two percent target ].
"low well" is not a phrase in that sentence. The phrase is "well after", in which "well" modifies "after", which implies "well after September". This is adverbial, modifying "keep rates low".
(Cross-posted.)