How to Use "principal" with Example Sentences

1. Europe 's principal problem isn 't the size of its members ' debt and deficits .
2. His principal management tool is a detailed , weekly profit report on every operation .
3. But under the european plan , the only backstop is the principal in the efsf .
4. Commentators on global english ask three principal questions .
5. Even the school principal would be evaluated on such statistics .