Here is a link for you to try some games:
Can you plural these words?
How many others can you think of?
You might like to try this word search or make your own:
Practise this rule over several days and recap it often.
SORRY – a couple of errors there. I said ‘when the vowel follows the -y’. I mean comes before. And, I’ve realised that you couldn’t see the anagram for batteries! Please excuse my ‘Friday brain!’