九. 语态
及物动词用在主动语态时要有宾语，因此可以变为被动语态;不及物动词用于主动语态时不能接宾语，因此无被动语态。
51. The two thieves have been disappeared.
disappear 为不及物动词，因此不能用于被动语态。所以把 been去掉。
52. The building built now will be our teaching building.
表“现在正在建的”应用被动语态的正在进行时，因此在built 前加being。
53. He is being operated by the famous doctor.
主动语态变为被动语态时，应注意短语动词的完整性，别忘了介词或副词。“给...…做手术”应为operate on sb，所以在operated 后加上on。
54. I wonder if the doctor has been sent.
原因同上，应在sent 后加上for。
55. The book written by him is sold well.
说一本书畅销是指书本身的属性，因此不用被动语态。本句应改为：The book written by him sells well.
56. This history book is worthy reading.
“值得被做”可以有如下几种说法：be worth doing; be worthy of being done; be worthy to be done. 因此本句可改为：This history book is worthy to be read.
十. 非谓语动词
57. We are going to talk about the problem discussing at the last meeting.
此处为分词作定语，问题应该被讨论，所以把discussing改为discussed。
58. The girl dressed herself in red is my sister.
dress为及物动词，意为“给...…穿衣服”，此处为分词作定语修饰girl, girl与dress是被动关系，因此把herself去掉。
59. Being seriously ill, his classmates sent him to hospital.
分词作状语时，其逻辑主语为这句话的主语，此句应为“因为他病了，他的同学才把他送到医院去”，因此把前半句改为：He being seriously ill.
60. Having not seen her for many years, we could hardly recognize her.
现在分词的否定应把not放在现在分词前面，所以前半句应改为：Not having seen her for many years.
61. Seeing from the space, the earth looks like a ball.
分词作状语，其逻辑主语应是这句话的主语，此句中地球应该被看，所以把Seeing 改为Seen。
62. English is easy to learn it.
此句中是不定式作原因状语修饰easy, English应该是learn的逻辑宾语，所以把it去掉。
63. I will get somebody repair the recorder for you.
“让某人做某事”可以有以下几种表达法：make sb do sth; have sb do sth; get sb to sth. 因此在repair 前加to。
64. She decided to work harder in order to not fall behind the others.
不定式的否定把not放在to前面。因此应改为：She decided to work harder in order not to fall behind the others.
65. It’s better to laugh than crying.
表比较时比较的双方应为同种结构，或都是名词或都是不定式。因此有两种改法：It’s better to laugh than to cry 或 It’s better laughing than crying.
66. It’s no use to send for the doctor.
做某事是没用的要说成It’s no use doing，所以把to send 改为sending。
67. She practices to play the piano after school every day.
practise 后只跟动名词作宾语，因此把to play 改为playing。
68. When the teacher came in, he stopped listening to the teacher.
stop doing 为停止做这件事，而stop to do 为停下来正在做的事去做这件事。所以后半句应该为：he stopped to listen to the teacher.
十一. 名词性从句
69. We are talking about if this plan should be carried out.
If 和whether都可以引导动词的宾语从句，如果从句做的是介词宾语，只能用whether引导。所以把if 改为whether。
70. I can not decide if to stay or not.
只有whether才能和不定式搭配使用。因此把if 改为whether。
71. My suggestion is we try for a second time.
表语从句的引导词如为that，一般不省略。因此在we前加上that。
72. What will the professor say is not known yet.
名词性从句的语序都是陈述句语序。因此应改为：What the professor will say is not known yet.
十二. 状语从句
73. I will go unless he invites me.
此句意为“除非他邀请我，否则我不去。”而unless相当于if not, 所以本句应改成：I won’t go unless he invites me.
74. Although he tried, but he still couldn’t keep up with the others.
although 和but 不能同时用在一句话中，去掉任何一个都可以。
75. I won’t stay until he comes back.
含有not…until的句子的谓语动词应是点动词，含有until的肯定句的动词应是延续性动词，此句有两种改法：I will stay until he comes back.或I won’t leave until he comes back.
十三. 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。
十四. 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为复数名词，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单独作主语时，谓语动词经常用单数，此处把are改为is。;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.
十五. 倒装
89. No sooner he had reached the station than the train left.
no sooner 为否定副词，放于句首时句子要部分倒装，因此此句应改为：No sooner had he reached the station than the train left.
90. Here comes he.
here 放于句首时，句子主谓要完全倒装，但句子主语为代词时，则主谓不倒装。此句应改为：Here he comes.
91. A child as he is, he can speak five languages.
用as引导让步状语从句，可把作表语的形容词、副词或不带冠词的名词放于as前。所以前半句改为：Child as he is.
十六. 虚拟语气
92. She would have come if we invited her.
这是与过去事实相反的虚拟假设，从句应该用过去完成时。所以在 we 后加 had.
93. My suggestion is that we would send a few people to help them.
suggestion 的表语从句也应用虚拟语气，必须用should加动词原形，should可以省略。此处去掉would 或把would 改为should。
94. The secretary wishes that she has time to type the letter now.
wish 后的时态应该把真实时态往后推一个时态，所以把has改为had。
95. It’s time that we go to bed.
句式为It’s time sb did sth. 所以把 go 改为 went。
96. I would rather you have another try tomorrow.
句式为would rather sb did sth. 所以把have改为had。
十七. there be 句式
97. There are a bag and several books on the table.
There be 句式遵循谓语动词就近原则，a bag为单数，所以把are改为is。
98. There were several people stood at the back of the room.
There be句式的谓语动词为be动词，句中其他的动词应为非谓语动词，所以把stood改为standing.
十八. 修饰语在句中的位置不当
99. We almost have written twenty compositions this term.
像almost这样副词在句中放在助动词、be动词之后，实意动词之前。因此把almost放在have后面。
100. The girl has beautiful, silky hair who lives high in the mountains.
定语从句应紧跟先行词，所以改为：The girl, who lives high in the mountains, has beautiful, silky hair.
