Separable phrasal verbs are those in which the verb and the particle can be separated by an object. For example, “turn off the lights” can be separated as “turn the lights off”. In this case, “turn” is the verb and “off” is the particle.

Nonseparable phrasal verbs are those in which the verb and the particle cannot be separated by an object. For example, “give up” cannot be separated as “give the game up”. In this case, “give up” is the phrasal verb and cannot be separated.

It is important to note that some phrasal verbs can be both separable and nonseparable depending on the context. For example, “take off” can be separated as “take the jacket off” or nonseparable as “I need to take off now”.