My spelling is terrible, and I'm not sure on other punctuation, but for some reason the apostrophe rules have stuck with me:
Something doesn't need an apostrophe because it's plural.
You're talking about possession in your case:
"Look what nurses say about our..."
I suppose the nurses might own what they say, but, say I think in this case would be a verb, and for them to own it it would have to be an noun. But the way (in my head) I sort it is can you turn it round to be. X belonging to (or of) the X.
So The dog's bowl=The bowl belonging to the dog.
The dogs' bowl=The bowl belonging to the dogs (ie multiple dogs)
Could you turn around "nurses say"?
"The say belonging to the nurses"? I don't think so.
So you don't need an apostrophe.
You could have "nurse's opinion" (one nurse)
or "nurses' opinion" (lots of nurses)
And then the other apostrophe rule is contractions. So where there are missing letters.
So if you can lengthen it then there's an apostrophe:
you're=you are: they're = they are: didn't = did not: would've = would have: I'm = I am etc.
So "you're a star" = "you are a star" - again I say this in my head to check.
The one (someone will probably say there's another!) exception to the rules is:
its/it's
You use "its" for possession and "it's" for contraction.
It's the dog = it is the dog
Its bowl= the bowl belongs to it.
Now if someone could explain where commas and semi-colons go please!