Question

compare as frases "mom and dad are fine"e"and my dog is fine. qual delas estar no singular e qual estar no plural

Answer 1

"My mom and dad are fine" está no plural.
O verbo to be, está no plural: "are" e os sujeitos da oração são: "mom and dad" (THEY)

Já em "my dog is fine" o verbo to be "is" está no singular e my dog = IT

Answer 2

"And my dog is fine" - Singular
"Mom and das are fine" - Plural