Phrasal verbs which take objects can be separable or inseparable:
Separable phrasal verbs can remain together when using an object that is a noun or noun phrase.
- I picked Tom up. OR I picked up Tom.
- They put their friends up. OR They put up their friends.
- We picked him up at the station. NOT We picked up him at the station.
- They put them up. NOT They put up them.
- We set off for the beach. / We set off for it.
- They are looking after the children. / They are looking after them.
Some phrasal verbs do not take objects. These phrasal verbs are ALWAYS inseparable.
- They thieves got away.
- The bus broke down on the way to work.
- She got up early.
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