1)从沉积岩中获取矿产资源是一项重要的现代工业活动。

不定式结构是主语

　　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)当有人在用吸尘器时，我很难集中注意力。

　　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作是谁做的，即不定式的逻辑主语，通常可以在特定的上下文中能看出，也可以通过带“for +名词短语”辨出　　It is quite important for us to read good books during the period of general review(总复习)。　　It is not difficult for those who study maths well to pass the exam.　　5、在某些形容词(如careless,clever,considerate,foolish,good,impolite,kind,naughty,nice,silly,stupid等)作表语时，不定式后可以加of来引导出其逻辑主语　　It is very kind of you to help me./It is stupid of him to do such a silly thing.　　间或也可用for + there to be 表示(而且there后面的不定式只能是to be)。

公司里有这么多麻烦，真是太遗憾了。

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