In the below article, the underlined 'did' refers to the word 'mature' in the same sentence. But, how about the word 'reach' in the previous sentence? Is it ok to say the word 'did' can also be replaced with 'reach' for having the similar meaning in the context?
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Hi. First, you might want to check the dictionary definition of reach - see the second listed verbal sense here. Questions here are expected to demonstrate some research effort on the asker's part, not least as that research can help potential answerers. Take a look at how to ask. Also consider if your question might be better suited to English Language Learners - generally, if a question would be trivial to a native speaker, that's a better place to go. – tmgr Dec 14 '18 at 10:11
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The verb did substitutes for the main verb in the same sentence (mature).
Did can't substitute for a verb of the previous sentence (for example, reach in the sentence from the answer) unless it is used immediately after the full stop before another verb.
For example:
"I saw Ann yesterday."
"So did I. She looked a bit frustrated."
"Did she?"
