To tell someone that they are in danger, shout Look out!
Look out! There’s a car coming!
Look out! It’s falling!
To suggest that someone pays attention to something, use Watch out…
Watch out, they’re behind you!
Road signs urging motorists to watch out for hedgehogs are set to be unveiled.
To tell someone to take care so that they do not have an accident, use Be careful …
Be careful on those steps!
Be careful! It’s icy outside.
Be careful with those scissors!
In British English, you canuse mind or mind out when you are telling someone to be careful of something.
Mind you don’t burn those sausages.
Do mindout for those oncoming cars, though.
To ask for help because you are in danger, shout Help!
Help! I can’t swim!
Help! The building’s on fire!
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