I don't understand the explanation to question 1 in the plurals test.

Q1: "She struggled up 11 storys just to tell her holiday stories"

Explanation: "A noun that ends 'ey' has the plural ending 'eys'; whereas, one that ends '[constant]' has the plural ending 'ies'.

Would someone please enlighten me.

Many thanks

Gordon,
there was a typo in your email with 'storys' which may be confusing you. The correct version is:

She struggled up 11 storeys just to tell her holiday stories.

The rule is:

A noun that ends "ey" has the plural ending "eys"; whereas, one that ends "[consonant] y" has the plural ending "ies".

Therefore:

storey (noun ending 'ey') > stories

and story (noun ending '[consonant]y') > stories.

I hope that's a little clearer.

Oh no, I'm doing it now.

Obviously, that should have been:

Therefore:

storey (noun ending 'ey') > storeys

and story (noun ending '[consonant]y') > stories.

http://www.grammar-monster.com/tests/tplurs1.htm

The test Gordon means is this one.

Thanks very much.
It's much easier when I read the sentence correctly!
Now I understand the rule.