CONNECTS the given line as the verb TOLD takes an object. here part P and part R both can be acted as an object but if we LOOK further in sentence Q(to give an INJECTION) then we can conclude that R is the first part of the sentence.Q further connects the sentence 'R' the nurse gives an injection to someone. Hence, 'Q' is the second part.P gives the answer to someone of sentence 'R' to whom the injection is being given. Hence, P is the third part.S is concluding the sentence. Hence, it is the last part.The correct sentence after rearranging the parts: The doctor told the nurse to give an injection to the patient after four hours. Important Rules to Solve the Para Jumbles:READ the sentences attentively and try to comprehend the idea or theme of the sentence and eliminate the irrelevant options.Try to identify the opening( independent sentence) and closing sentences ( concluding sentence).Try to identify the mandatory pairs. Two sentences can be connected through various connectors and other determinants.