Infinitives（不定式） and infinitive phrases（不定式短语） can also be modifiers（修饰语）. The rule for infinitives: the implied subject of an opening infinitive must be the same as the subject of the sentence.（在大多数情况下，开放不定式的隐式主语必须与句子主语相同）

原句： In order to ensure achievements of the Party’s political, military and economic objectives, Mao emphasized that the Party must first consolidate its ranks.

修改: Mao emphasized that to ensure achievements of the Party’s political, military and economic objectives, Mao emphasized that the Party must first consolidate its ranks.

【分析：In order to ensure …的主语实质上是Party，而非Mao】

原句： To lead China into the 21^st century, efforts must also be made to promote cultural and ethnical progress, to consolidate the Party, to strengthen unity among China’s various ethnic groups, and to maintain political stability.

修改: To lead China into the 21^st century, we must also promote cultural and ethnical progress, consolidate the Party, strengthen unity among China’s various ethnic groups, and maintain political stability.