Position of the phrasal verb

1. Usually the phrasal verbs is not separated.

The car broke down on the motorway

In September I took up French

We grew up on a farm

2. If the phrasal verb has an object. There are two possible positions for the object:

I turned on the light

I turned the light on

If the object is a pronoun (him/her/me/it/etc) only one position is possible:

in between the verb + preposition.

I turned it on

More examples

Don't throw away the jumper / Don't throw the jumper away

Can you fill in this sheet? / Can you fill this sheet in?