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Why we use two preposition in the sentence given below

Whenever I called **in on ** Sam, he talked on phone.


  • @sadufrahman, there's no reason. There's a three-word verb call in on, and you just have to learnt.

  • Some grammar books try to make two-word and three-word verbs less confusing by using a different term for words which look like prepositions but don't behave like prepositions.

    In the call in on example, the terminology would be

    • on — PREPOSITION

    This isn't really an explanation, but perhaps it can help you to recognise what to learn.

    Grammar books use different terms for these verbs. Here is one set that's commonly used.

    • PHRASAL VERB call in e.g. Jim called in today.

    • PREPOSITIONAL VERB call on e.g. I call on you to resign.


  • Thank you David good explanation

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