Excuse me sir, there's a fly in your soup.
When children forget the final "s" on a plural, eg "I have two cat", the teacher says "ZZZZZZZZZZZZZZ!" and pretends to follow a fly around the classroom with his finger. He then claps his hands dramatically to kill it. This is to prompt the children to say "two cats". After the teacher has done this enough times, when someone forgets a plural, another child will start pretending to kill a fly, thus correcting his classmate (in a fun way!). This also works for third person singular mistakes (He live in York).
I've also tried this on adults with success.
Timothy Brook, Naples, Italy
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