例句1 The subjects took a fifty-question test to see which words they remember.
這是不定式做目的狀語.
2 Successful learners do not wait for a chance to use the language .
這是不定式做定語
⒈不定式作定語
不定式在句中作定語,置于被修飾的名詞或代詞之后.如：
①The next train to arrive is from Washington.
②Do you have anything to be taken to your sister?
③Do you have anything to say on the question?
④Would you please give me some paper to write on?
⑤My wish to visit France has come true at last.
不定式短語作定語和被修飾詞之間表示以下關系：
(1)表示將來的動作（例①）.
(2)與被修飾詞之間有動賓關系,如是不及物動詞,則需加介詞（例④）.
(3)與被修飾詞之間有動賓關系,同時與句中其它詞之間又有邏輯上的主謂關系時,盡管有被動含義,卻仍 用主動語態(tài)（例③）；如只有動賓關系,而無邏輯上的主謂關系,則需用被動語態(tài)（例②）.
(4)不定式作定語時,一般可轉(zhuǎn)換為定語從句,例①to arrive=that will arrive.