Answer:
Is F.R.I.E.N.D.S. the most watched TV series all over the world?
Step-by-step explanation:
To change the sentence "F.R.I.E.N.D.S. is the most watched TV series all over the world" into an interrogative sentence, we can simply invert the subject and verb. This gives us the following sentence:
Is F.R.I.E.N.D.S. the most watched TV series all over the world?