IV: rewrite the following sentences as suggested
1.The bed has no mattress .I sleep on this bed.   (Using preposition+ relative pronoun)
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2.I saw several houses .Most of them were quite unsuitable.    ( Using relative pronoun)
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3.I would like to buy a house which overlooks a garden.     ( reducing relative clause)
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4.The doctor was the first winner who was awarded a big prize by the university.( reducing relative clause)
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5.Because of poverty,the student cannot go to university 
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6.Having bought the cassette player ,he found its defect.
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