Hello Teachers,

I often struggle when to use a comma before the word 'as'. In the following sentence, shall we add comma after 'track' and before 'as'? What is the common rule for this?

Related storms also caused extensive damage and killed horses at a Kentucky race track as a line of severe thunderstorms crossed the area.

Thanks in advance,
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Comments  (Page 2) 
You don't need the comma at all because 'He died' is the main clause and 'as lightning struck' is the subordinate clause. I think a comma would only be needed if you started with the subordinate clause: 'As lightning struck, he died.' To me, 'He died as lightening struck' means he died at the same time as the lightning struck. If you want to convey that he died because the lightning struck, you'd probably be better not to use 'as.' I'm not an expert but that's my understanding of it anyway!
Clive is correct. Imagine writing a story where a sick person is dying in bed. At the moment of his death, lightning strikes. This makes the death scene more dramatic, and this is how 'He died, as lightning struck.' is read. He could have been in his bed and the lightning outside. Now, if the man was outside and hit by lightning and killed, the sentence 'He died as lightning struck.' would make more sense.
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what about the sentence:

She hadn't slept all night and, as she hobbled across the street, her eyes streamed with tears.

Do you need the commas, or does it read more fluidly without?

Thanks in Advance