Question by maestro: why is a comma necessary before words ending with “-ing”?
examples:

1. “I dealt with him standing beside the door, looking at me and saying…”

2.”I started working the next day, cleaning the cages and helping the kids.”

3.”She is a former model, having modeled for a number of businesses and photographers”
@Cheyanne- you’re an idiot. You can’t put a semi colon because the second clause is an dependent clause, not independent. Semi colons are used to connect 2 independent clauses, when not using a fanboy between them.

Best answer:

Answer by Bob B
It’s not the “-ing” that’s the reason for the comma. In each case, the comma sets off whatever phrase follows it.

The sentence:

“I dealt with him standing beside the door, all full of himself and saying…” would still require the comma even without the “-ing” wording.

[added]
If it were the case that a comma was required before an “-ing” word, the first two examples would need commas before the words “standing” and “working”.

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