Some of the sentences below contain mistakes. Correct them and explain what is wrong.
There is a draught here. Let’s close a window.
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We have to ask a tutor about that excursion.
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A register is probably in a deanery.
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The professor looks very smart today.
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Can I write this sentence on a blackboard?
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Please close a door after you when you come in.
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Could you put those books on a desk?
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I left the book on a professor’s desk.
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Let me carry a bag for you. It looks heavy.
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Will you switch on the light? It’s dark here.
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