The word (is) is always used as a verb in written and spoken English.
Adjectives are descriptive words that describe other words and answer a question.
Thus, in your sentence, the adjective is the word red, as is tells the reader what color the shirt is.
Principal,
We will dearly miss you. You have not only made this school great, but you have also made us, the students, great. We thank you for all your hard work and dedication that you put into this school. We wish you farewell and hope you enjoy your retirement.
Well, he went from being a happy man with a family to a man who just cared about making money and working and the only guy he treated like family, died. So, therefore he ran the company by him self and he was never home. He was always doing things for work.
