When to use year's and years...

You may say the following:
I have a year's experience studying in China
I have one year of experience in import and export business with China
I have 10 years' experience working as a planner in China
I have 10 years of experience in dealing with Chinese commerce

Thanks very much Goodman.

So you use 'year's' when you are purely referring to one year and you use 'years' when you are referring to more than one year?

Andy

Anyone?

I thought I already answered you. I think Goodman's reply is very clear that that's the case.

Thanks new2grammar.

So, just to triple check, you are saying that the below rule is correct:

'So you use 'year's' when you are purely referring to one year and you use 'years' when you are referring to more than one year'. Also, you would never write 'one year's experience', instead, you would write 'a year's experience' or 'one year of experience'

Sorry to ask

Andyw12345you use 'year's' when you are purely referring to one year and you use 'years' when you are referring to more than one year'.

I won't repeat my answer. Because you might ask again. To convince yourself, ask yourself this.
I have a cat or I have a cats
The cat's toys are fluffy. (There is one cat but many toys)
The cats' toys are fluffy.

One More than one
Possessive year's years'

Not possessive year years
___
You can use any of these:
a year's experience; one year's experience; two years' experience; three years' experience
a year of experience; one year of experience; two years of experien

That's why there is only one C.J. One word says it all, "possessive"
Your explanation is simple and clear.

Thanks CJ - this is a realy helpful explanation :-).

ANDY