1. We did not receive your cheque and you sent it last week.




    The connective ‘and’ is very clumsy here. It is better to use a relative clause, in which case you would have to change ‘your’ cheque to ‘the’ cheque.


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  2. Is that the restaurant in where you all got food poisoning?




    It is incorrect to say ‘in where’.


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  3. Mary was the nurse on duty. She saved the patient’s life.




    The two sentences are too short. They should be combined to form a relative clause or linked with ‘and’ to make a compound sentence.


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  4. The Industrial Centre, it is located near the Sports Ground, is closed on public holidays.




    The ‘wrong’ example has a comma splice. You need to make a non-defining relative clause.


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  5. There are the children the headmaster awarded them a special prize.




    We should not add an object pronoun (‘them’) in this case.


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  6. The new CEO will introduce many new ideas who we hope will bring us out of the red.




    The relative clause should come after the subject that it is describing.


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