九、作形式主语

(一)、替代动词不定式

It is + adj. to do sth.

83. It is good to eat vegetables.

84. It is an honor to have been asked to speak at themeeting.

It is + adj. +for sb. to do sth.

注意：此结构中的形容词是描述事情的、说明句尾动词不定式特征的形容词。这些形容词主要有certain, clear, dangerous, difficult, easy, hard, illegal, impossible, important, obvious, possible, polite, proper, right, unnecessary, unimportant, unlikely, useless, useful等。

85. She is such an eccentric woman that it is difficult for anyone to get on well with her.

86. It is a good custom for young people to give up their sets to old people in the busestrains, or subways.

It is + adj. + of + sb. to do sth.

注意：本句型中的形容词一般表示人(逻辑主语)的某种特性，要么是夸赞，要么是贬损。主要有brave, careful, careless, considerable, cruel, clever, foolish, good,grateful, generous, impolite, kind, nice, polite, rude, silly, stupid, thoughtful, unkind, wise, wrong,等。

87. It is kind of you to lend me so many books.

88. It is clever of you to solve so difficult a problem.

89. It is wise of you to refuse his offer.

90. It is remarkable of her to be always working like this.

It is a pity(for sb.) to do sth. 很遗憾做某事

91. It would be a pity to miss the opening ceremony.

92. It is a pity for you not to go to Paris with us.

It is a great relief (to sb.) to do sth. 做……是一大慰藉；……真叫人送了一口气

93. It is a great relief to have rain after a long time of drought.

94. It’s a great relief to me to know you are safe.

95. It’s a great relief to hear that she won the prize.

It is worth while to do sth. 做……是值得的

注意：本句型就相当于It pays to do sth.；worth while 不要写成worthwhile。

96. It is worth while to take a trip abroad.

97. It is worth while to learn English.

It’s best to do sth. 最好做某事 = To do sth. is best.

98. It’s best to set off tomorrow. 最好明天动身。 = To set off tomorrow is best.

99. It’s best to review the lessons one more time. = To review the lessons once more is best.

It’s better to do A than to do B = To do A is better than to do B.

100. It is better to borrow than to buy. = To borrow is better than to buy.

101. It’s better to stay at home than to go to the cinema. = To stay at home is better than togo to the cinema.

How is it possible to do sth.? ……这怎么可能？

102. How was it possible to fall down from the third floor without being hurt?

103. How is it possible for a girl of ten to fly an airplane?

It’s no use to do sth. 做……是没有用的

104. It’s no use to argue with him.

105. He doesn’t know the answer, so it is no use to ask him.

It takes (sb.) + 时间/条件 + to do sth. 某人花了多少时间做某事；做某事需要……(条件)

106. It takes me half an hour to walk from here to school.

107. How long does it take to fly Being to London?

108. It takes patience and hard work to master English.

It costs sb. some money to do sth. 某人花多少金钱做某事

109. It cost him a great deal of money to take the trip.

100. It cost me 2000 dollars to collect these stamps.

It occurs to sb. to do sth. 某人突然想到做某事

111. It never occurred to me to take advantage of you. 我决没有想到过要占你便宜。(利用你)

It feels + adj. + to do sth.

112. It feels pleasant to talk with her. 同他谈话使人感到愉快。

113. It must feel strange to have a twin brother.

114. It feels unhappy to be with him.同他在一块让人感到不舒服。

115. It feels nice to take a walk in the evening. 晚间散散步感觉很好。

其它例句

116. It seems a pity not to have taken his advice.

117. It won’t hurt to postpone the party for a few weeks.

118. It did surprise me to hear you say so.

119. It gave great pleasure to have finished this work ahead of the dead line.

(二)、替代动名词

动名词可以直接位于句首作主语，但为了强调，或动名词过长时，要用it作形式主语置于句首，而把动名词放到句子最后。这也是英语尾部重压原则所要求的。

It is no good/use (in) doing sth. 做……是没用的；做……是白费力气的

= It is of no good/use doing sth.

= It is not any good/use doing sth.

120. It is no sue crying over spilt milk.覆水难收，悔恨无益。

121. It is no use trying to drown your sorrows in drink. 解酒浇愁无济于事。

122. It’s no good getting cross with him.和他生气没有用。

123. It’s no good reading without full understanding.

It’s exciting doing sth.

124. It’s exciting meeting you here.

It’s dangerous doing sth.

125. It’s dangerous playing with fire.

It’s foolish doing sth.

126. It’s foolish behaving like that.

It’s pleasant doing sth.

127. It’s pleasant lying in the sun.

It’s fun doing sth.

128. It’s fun being a magician.

It’s no use doing sth. 做……没有用

129. It’s no use crying over spilt milk.

130. It’s no use regretting.

131. It’s no use you running away.

注意：

1. 辨析：It’s no use doing sth. & It’s no use to do sth.

132. It’s no use doing sth. 通常指比较一般的情况。

133. It’s no use to do sth.常指具体的情况，也就是指在某一特定的场合所发生的事情。

2. 类似句型

134. It’s useless to do sth.

135. It’s of no use to do sth.

It’s a nuisance doing sth. 做……很烦人。

136. It’s a nuisance having to do so much homework.

注意：这一结构中的动名词还可加one’s即物主代词来充当该动名词的逻辑主语。

137. It’s a waste of time your talking to him. It is just like casting pearls before swine.

138. It was great encouragement to us their coming to help.

139. It is useless doing that over and over again.

注意：辨析：It’s nice to do sth. & It’s nice doing sth.

140. It’s nice to do sth. 常用于见面或活动开始； It’s nice doing sth.则用于分手或活动结束。

141. It’s nice taking a walk in the evening.

142. It’s so nice sitting near a fire in winter.

143. It’s nice to meet you here.

144. It’s nice to have a talk with you. (说话开始)

145. It’s nice talking with you. （谈话之后）

It’s hard doing sth.做某事有困难

146. It’s hard learning English well.

It’s interesting doing sth.做某事有趣

147. It’s interesting going sight seeing.

It’s easy doing sth.做某事容易

148. It’s easy working out this problem.

(三)、替代主语从句

句型一：It + be + adj. + that从句