Fill in the blank with appropriate verbs :
1) The teachers along with the principle (blank) (is/are) discussing the board results.
It should be:
1) The teachers along with the principal are discussing the board results.
But if it was: "The principal along with the teachers ___ (is/are) discussing the board results," then the answer would be "is".
By the way, your spelling of "Principal" is incorrect.Principle means afundamental truth or proposition that serves as the foundation for a system of belief or behavior or for a chain of reasoning.Principal meansthe person with the highest authority or most important position in an organization, institution, or group.