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定语从句
76. An orphan is a child who’s parents are dead.
定语从句中表“…的”引导词只有whose，所以把who’s 改为whose。
77. This is the very thing which I lost yesterday.
如果先行词为物且前有the only, the last, the very修饰时，定语从句的引导词只能用that。
78. This is the car for that I paid a high price.
定语从句的先行词为物，而且引导词放在介词后时，只能用which.
79. She is one of the students who has passed the exam.
定语从句修饰one of 加上复数名词时，复数名词是定语从句的先行词，因此把 has 改为have。
80. This is the place where we visited last year.
定语从句的先行词用关系代词还是关系副词要看定语从句中缺不缺主语或宾语，如缺用关系代词，如不缺用关系副词。此句中visit为及物动词，后无宾语，因此把where 改为which或that。
81. I, who is your friend, can understand you.
定语从句的谓语动词应与其先行词保持一致，因此把is 改为am。
82. China is a developing country, that is known to all.
非限定性定语从句的引导词永远不会是that，因此把that 改为which 或as。
主谓一致
83. The poet and writer are invited to give a speech at the meeting.
poet和writer共用一个冠词，指的是一个人身兼二职，所以谓语动词应为单数。把are改为is.
84. No one except my parents know it.
主语后加except再加上若干数量的名词，谓语动词和主语保持一致。所以把know改为knows。类似的用法的词或短语有：but, besides, with, together with, along with, as well as等等。
85. Your clothes is on the table over there.
clothes为复数句词，谓语动词应为复数。把is改为are。
86. The number of the students in that school are about one thousand.
此名的主语为number而不是students。因此把are 改为is。
87. The class was watching TV when I entered the room.
class作主语时，把它看成一个整体时谓语动词用单数，看成每一个成员的个体行为时谓语动词用复数。一般来说，一些具体行为如看电视、吃饭、洗澡等都属于每一个成员的个体行为。此处把was改为were。
88. The population of our country are increasing slowly now.
population 单独作主语谓语动词经常用单数；如果其前有分数或百分数，而且后面又有复数名词时谓语动词用复数。如：One fifth of the Chinese population are workers. 此处把are改为is。