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Two of my friends are turning thirty.

The indefinite article is used for singular nouns. So, if there is only one thirtieth celebration for both my friends, do we say I have a friends' thirtieth?

But if both of my friends are having two separate celebrations, do we say I have friends' thirtieths?

Thanks
Comments  
I should methodically avoid both of your suggestions. Emotion: nodding

With any luck at all, you won't need them. Emotion: shake
Oh, but I want to know, even if i don't need to use them. Emotion: crying
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English 1b3But if both of my friends are having two separate celebrations, do we say I have friends' thirtieths?
Are the separate ones the same or are they having four? - Or is each having two, but two are the same party so they're having three? I suppose it doesn't matter as long as there's more than one, as you've said.
Hi,

If you said to me, 'Hello, Clive. Tomorrow I have friends' thirtieths',I would have no idea what you were talking about.Emotion: sad

Clive
CliveIf you said to me, 'Hello, Clive. Tomorrow I have friends' thirtieths', I would have no idea what you were talking about. Emotion: sad
I would have the same reaction, but even more so because my name isn't Clive. Emotion: big smile

friends' thirtieths? Nope. No one I know would say such a thing.

There is probably a better example, if not several, for presenting the grammatical problem of interest.

CJ
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These are both OK, if this is the topic you're trying to investigate.

I drive a friend's car to work from time to time.

I drive friends' cars to work from time to time.

CJ