Betty and Tina is happy.
❌ Betty and Tina = they. They are happy.
Dora is young.
✅Correct! Dora = she. She is young.
I and Roy is best friends.
❌ Incorrect. I and Roy = We. We are best friends.
My grandma are old.
❌ My grandma = She. She is old.
My mother are in the kitchen.
❌ My mother = she. She IS in the kitchen.
The birds is hungry.
❌ The birds = they. They are hungry.
Peter is a farmer.
✅ Correct! Peter = he. He is a teacher.
Carl and Aidan are pilots.
✅ Correct! Carl and Aidan = they. They are pilots.