Can "principle" be used as a plural? I don't know but if not how can one answer a question about a sentence if the question is worded incorrectly? Maybe the word is pluralized without an "s" in some cases. Regardless, I don't know the major principle(s) of a sentence but I'd guess that it has to start with an upper case character & end with a punctuation mark. This probably answers a different question though. What do you want? I'm a friggin woodworker not a wordsmith. (although I do pretty well at Scrabble)
"a man of principle" "the principle of jet propulsion"
They don't eat meat on principle.
The principle of the matter was elusive, at best.
The major theme of life without principle is freedom.
He made the decision based on forethought and principle.
A judge must be a person of high principle. perfect
The word principle means a basic belief, truth, natural law or source from which something proceeds. Therefore, acceptable sentences could be:The principle of gravity dictates that when I release this book, it will fall to the floor.As a man of high principles, the Governor would not accept a bribe.
Ummm..... " I had to go to the Principle's office today ".
no
The principle was the dean of the school.
Suppression of religion
The principal of the school emphasized the importance of honesty as a guiding principle for all students.