気を付ける (to be careful)

Watch out. The cops are sniffing around.

You can't be too careful when choosing friends.

Many courses ban shoes with spikes, so be careful.

Sure, go ahead. See you later. But be careful driving, okay?

Be careful not to drop the eggs.

You've got to be careful when choosing friends.

You should be careful when choosing friends.

You need to be more careful when you're playing baseball.

Be careful not to fall asleep.

I'll make sure everything goes well.

She's careful not to hurt other people's feelings.

She's careful about her child's nutrition.

She was careful not to break the glass.

You should mind your manners.

You have to mind your manners.

You have to be careful when you're carrying a friend.