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<http://schema.org/text>
"In your example, “reading all these books\" is not an \"adjective phrase.\" It is a gerund phrase (using a verb \"reading\" as a noun). It's not an introductory phrase, as discussed in this blog post, so it would not be followed by a comma. \"Reading all these books\" is a single action; therefore, it requires a singular verb. \"Reading all these books provides me with extra knowledge” would be grammatically correct and properly punctuated. If you had \"Reading all these books, I gained extra knowledge,\" that would be using a gerund in an introductory phrase."
<https://kathyide.com/starting-sentences-with-ing-words/?replytocom=6214>