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as if和as though引导的从句所叙述的情况与事实相反时，从句的谓语动词多用虚拟语气。在虚拟语气结构中，用________时态来表示现在的情形；用________时来表示过去的动作或状态；用________时表示正在进行的动作；用________时表示将要发生的动作。
当as if和as though从句的主语和主句主语一致，且从句中含有系动词be的某种形式时该主语和系动词可以省略。
例如：John paused as if(he was)expecting Mary to speak．
判断正误，正确的用“T”表示，错误的用“F”表示。
The horse is enough tall to reach the big branch of the tree．
Mrs. Green was eighty,but she had a small car ,and she always drove to the shops in it on Sunday and bought her food.
She did not drive fast,because she was old,but she drove well and never hit anything.Sometimes her grandchildren said to her,“Please don’t drive your car,we can take you to the shops.”
But she always said,“No,I like driving.I've driven for fifty years and I’m not going to stop now.”
Last Sunday she stopped her car at some traffic lights because they were red,and then it did not start again.the lights were green,then yellow,then red,then green again,but her car did not start.
“What am I going to do now?”she said.
But then a policeman came and said to her kindly,“Good morning,Don’t you like any of our colors today?”
判断下更句子的正误，正确的用“T”表示，错误的用“F”表示：
1．She always bought her food on Saturday.
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2．She did not drive well.
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3．She has driven for fifty years.
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4．Her grandchildren were happy when she drove her car.
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5．Mrs. Green’s engine did not start that day.
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阅读理解
Mr. Robinson never went to a dentist, because he was afraid, but then his teeth began hurting a lot,and he went to a dentist.The dentist did a lot of work in his mouth for a long time.On the last day Mr.Robinson said to him, “How much is all this work going to cost?”The dentist said, “Twenty-five pounds,”but he did not ask him for the money.
After a month Mr.Robinson phoned the dentist and said, “You haven’t asked me for any money for your work last month.” “Oh,”the dentist answered, “I never ask a gentleman for money.”
“Then how do you live?”Mr.Robinson asked.
“Most gentlemen pay me quickly,” the dentist said, “but some don’t.I wait for my money for two months,and then I say, ‘That man isn't a gentleman’and then I ask him for my money”.
判断正误（正确的用“
T”表示，错误的用“F”表示）1．Mr. Robinson went to the dentist because his teeth hurt.
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2．The dentist wanted twenty-five pounds from Mr. Robinson.
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3．Mr Robinson paid the money quickly.
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4．Mr Robinson phoned the dentist after a month.
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5．The dentist waited for the money for three months.
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