The words that make up non-separable phrasal verbs cannot be separated, and they are not followed by a noun or a pronoun object.
Examples:
- When she saw what happened, she broke down.
(No noun or pronoun object follows the phrasal verb. Break down = lose control of one's emotions) - We decided that we should get together more regularly.
(Get together = meet and spend time with one another) - They shouted to him to hurry up.
(Hurry up = act or move quickly) - He asked them to join in the singing.
(Join in = participate or become involved in an activity) - We enjoyed looking around an organic farm.
(Look around = go through or explore a place) - He was given a week to move out after he fought with other tenants.
(Move out = leave a place [house, etc] where one has been living) - I had to pull over when I had a puncture.
(Pull over = move and stop a vehicle to the side of a road) - We waited but he didn't show up.
(Show up = appear somewhere by appointment or unexpectedly) - After what happened, he promised to speak up.
(Speak up = say openly about something) - We stayed up late to watch the match on television.
(Stay up = continue to be awake)