حلواني,
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Had they worked hard,they would have got high marks
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Ben Clinton, who was the president of America, was not aggressive (drop who)
Ben Clinton , the president of America, was not aggressive.
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2-a) my sister who lives in America is a nurse
b)my sister, who lives in America, is a nurse
a. I have many sisters
b. I have only one sister
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3-a)the weather is interesting
b)she is interested in reading short stories
a. The noun '' weather'' performs the action
b. the pronoun ''she'' recieves the action.
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4-the captain who was Spanish was very skilful (reduce this relative clause
The captin was very skilful.
A relative clause (it is called also an adjective clause) is a dependant clause that modifies a noun. It describes, identifies, or gives further information about a noun.