Phrasal verbs where the object must come after the particle: look after the children (not look the children after)
Verb + particle + object (always this order)
Don't/Didn't + verb + particle + object
Did you + verb + particle + object?
💡 Unlike separable verbs, the object never goes between verb and particle.
✓She looks after her grandmother.
✗She looks her grandmother after.
Look after is inseparable.
✓I ran into an old friend.
✗I ran an old friend into.
Run into is inseparable.
✓We're looking forward to the party.
✗We're looking the party forward to.
Look forward to is inseparable.