3.90 preposition or adverb

In the case of some intransitive phrasal verbs, the second word can be a preposition if the second thing involved needs to be mentioned, or can be an adverb if the second thing involved is clear from the context.

• I could hang around your office.
• We'll have to hang around for a while.
• ...a dog who had lagged behind the others.
• After a while, I see he is deliberately lagging behind.

3.91

Here is a list of intransitive phrasal verbs whose second word can be a preposition or an adverb:

• ask around, bend over, break through, bustle about, come across, come after, come along, come by, come down, come in, come off, come on, come over, come through, come up, cross over, crowd around, do without, fall behind, fall down, fall off, gather around, get in, get off, get on, get round, go about, go along, go down, go in, go round, go through, go up, go without, hang around, join in, knock about, lag behind, lean over, lie about, look round, look through, lounge about, move about, pass by, pass over, push by, push past, push through, rally round, run around, run down, run up, scrape through, see round, shine through, show through, sit around, spill over, stand around, stop by, trip over