Relationships
be on your best behaviour
act especially politely
If you are on your best behaviour, you are being especially polite and careful about how you act.
Hear it in real life
The head teacher is visiting tomorrow.
Then we'd better be on our best behaviour.
Please be on your best behaviour when you meet my parents.
The mistake everyone makes
Not: The children were in their best behaviour at school.
Say: The children were on their best behaviour at school.
The fixed preposition is "on," not "in."
Build it
How it fits in a sentence.
be on your best behaviour; tell someone to be on their best behaviour
Your turn: say it out loud
Please be on your best behaviour when you meet my parents.
Say it out loud two or three times, until it feels like yours.
be on your best behaviour
act especially politely
“Please be on your best behaviour when you meet my parents.”
heytardy
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