1.   Clearly we can not as yet give a definitive answer to this question.

2.   Clearly, this study can not provide a definitive answer.

3.   He has refused, arguing that a definitive legal answer would split the country irrevocably.

4.   No one can provide definitive answers to these questions.

5.   None can provide a definitive answer to the question of whom resources should be spent on.

6.   This fundamental question does not yet have a definitive answer.

7.   To ask for definitive answers to such grandiose questions would, of course, be a tall order.

8.   No one has come up with a definitive answer as to why this should be so.

9.   We need a definitive answer to this question.

10.   Clearly, this study cannot provide a definitive answer.