Phrasal verbs are verbs that have a preposition that changes the meaning of the verb from its base form. If the verb is separable, it means that the verb and the preposition can either be together in the sentence or divided with the object in between.
If you use a pronoun to replace the object, the pronoun must go between the verb and preposition.
Unfortunately, there is not surefire way to tell if a phrasal verb is separable or inseparable. It just takes a bit of memorization.
Here is a list of some separable phrasal verbs.
Call off – to cancel
Call off the party. / Call the party off. / Call it off.
Eat up – to eat, usually happily or quickly
They ate up the cake in four minutes. / They ate the cakes up in four minutes. / They ate it up in four minutes.
Figure out – to solve a problem or find the answer
We figured out the impossible math problem. / We figured the impossible math problem out. / We figured it out.
Give out – to distribute
Why did you give out all your money to strangers? / Why did you give all your money out to strangers? / Why did you give it all out to strangers?
Hold up – to rob or to delay
The man held up the bank. / The man held the bank up. / The man held it up.
Jack up – to raise or lift up
We jacked up the car to change the flat tire. / We jacked the car up to change the flat tire. / We jacked it up to change the flat tire.
Let down – to disappoint
Don’t let down your mom. / Don’t let your mom down. / Don’t let her down.
Make up – invent or create (a story, fantasy or lie)
Did you make up this story? / Did you make this story up? / Did you make it up?
Pay back – to repay a debt
They paid back the loan as fast as they could. / They paid the loan back as fast as they could. / They paid it back as fast as they could.
Quiet down – to lower the volume
She quieted down the crying baby. / She quieted the crying baby down. / She quieted it down.
Show off – to brag or show something with pride
The girl showed off her awards to anyone who would look. / The girl showed her awards off to anyone who would look. / The girl showed them off to anyone who would look.
Take over – to claim control of, to take by force
The military took over the country. / The military took the country over. / The military took it over.
Wipe off – to clean by brushing off
He wiped off the messy baby’s face. / He wiped the messy baby’s face off. / He wiped it off.