(1)被修飾的名詞前有序數詞、形容詞最高級或next, last, only, not a, the, very等限定詞時，該名詞用不定式做定語。如：the first woman to set foot on the moon 第一個登上月球的女性。

(2)如果其動詞要求不定式做賓語，相應的名詞一般用不定式做定語。如：

tendency to do→tend to do, decision to do→decide to do

This book is an attempt to help you use English and recognize how it is used.

(3)如果其形容詞形式要求接不定式做補語，相應的名詞一般用不定式做定語。如：

ambition to do “干……的雄心”→be ambitious to do“有雄心干……”

curiosity to do “對……的好奇心”→be curious to do“對……好奇”

ability to do“做……的能力”→able to do“有能力做……”

According to Darwin, random changes that enhance a species’ ability to survive are naturally selected and passed on to succeeding generation.

(4)表示方式、原因、時間、機會、權利等名詞用不定式做定語，這些名詞包括：

way, method, reason, time, place, chance, occasion, opportunity, evidence, power, right, movement, drive (運動)，effort等。如：I worked so late in the office last night that I hardly had time to catch the last bus.

We appreciate your efforts to bring about a comprehensive solution to the existing problem.

(5)不定代詞something, nothing, little, much, a lot習慣上用不定式做定語。如：

Though we have made great progress, there is still much to be improved.