In some phrasal verbs, the verb and the participle cannot be separated. An object cannot come between the verb and the participle. It can come only after the verb and the participle. Usually, the noun or pronoun comes after the participles:
- He will look after my dog while I am away.
- (INCORRECT: He will look my dog after while I am away.)
- They called on her when she was hospitalized.
- (call on = pay a brief visit. INCORRECT: ... called her on...)
- Jack ran into Jill while he was on his way home.
- (run into = meet by chance)