You should tell Kylie that you lost her maths homework.
If I were you, I'd tell Kylie that you lost her maths homework.
Why don't you say sorry to Parker for scratching his new bike?
If I were you, I would apologize to Parker for scratching his new bike.
You should be more careful with that juice. You don't want to spill it.
I'd be more careful with that juice if I were you, you don't want to spill it.
You shouldn't play baseball near Mr. Lopez's house.
I wouldn't play baseball near Mr. Lopez's house if I were you.