江西成人高考高起点英语语法归纳与练习十七

    lesson 17 动词不定式（二）

    第二节 动词不定式的用法

    一、 不定式结构作主语

    1. 不定式前置

    1） Derive ［A］ mineral resources from ［B］ sedimentary rock ［C］ is a ［D］ major modern industrial activity.

    2） in the matriculation for postgraduate in a short time is realy a hard nut.

    ［A］ To make high scores［B］ To make low goal［C］ To the high scores［D］ Make the low goals

    2. 上述形式一般情况不多见，作为考试的规范英语，如果不定式较长，显得头重脚轻，则可由代词“it”作形式主语（形式主语“it”不能由“that”或“this”等其他代词代替），而将不定式放到后面

    It is really a hard nut to get high scores in the matriculation for postgraduate in a short time.

    3） John admitted that it's always difficult .

    ［A］ for him being on time［B］ being on time for him

    ［C］ for him to be on time［D］ on time for him

    4） It is difficult for me ［A］ to be concentrating ［B］ while someone ［C］ is using ［D］ a vacuum cleaner.

    3. 不定式后置的情况不仅限于动词是系动词，也适用于其他动词

    It took us a great deal of efforts to finish that task.

    It made him extremely happy to get contact with his family in Taiwan since they separated more than 40 years ago.

    4. 不定式结构所表示的动