Less frequent patterns
V behind nThe verb is followed by a prepositional phrase which consists of behind and a noun group. The prepositional phrase is the prepositional Object in the case of lag and trail, and an Adjunct in the case of fall in. This structure has no passive.
The phrasal verb fall in has the pattern V P behind n.
lag trail fall in
My mates and I fell in behind the marchers.
Small employers have tended to lag behind their larger counterparts on the matter of pension scheme equality.