Answer:
My birthday is on Friday.
Explanation: Singular subject + Present tense verb = The verb will end in-s. (A little-known but consistent "rule"
Present: It is Friday today.
Past: Yesterday it was Thursday.
Use am only with I. I am confident.
Use are (present) and were (past) with you, and plural subjects.
You are learning. We are thinking. They are happy.
You were worried. We were working. They were beautiful.
