Their cousin (are / is) in the tenth grade.
Their cousin (is) in the tenth grade.
My daughters (are / is ) in the second grade.
My daughters ( are ) in the second grade.
His granddaughters (are / is) in the eleventh grade.
His granddaughters (are) in the eleventh grade.
The girl (are / is ) in the first grade.
The girl (is ) in the first grade.
That boy (are / is) in the fourth grade.
That boy (is) in the fourth grade.
Those students (are / is) in the seventh grade.
Those students (are) in the seventh grade.
Our son (are / is) in the third grade.
Our son (is) in the third grade.
This kid (are / is) in the twelfth grade.
This kid (is) in the twelfth grade.
(Are / Is) you in the sixth grade?
(Are) you in the sixth grade?
I (am / are / is) not in the fifth grade.
I (am) not in the fifth grade.
My twin brothers (are / is) in the eighth grade.
My twin brothers (are) in the eighth grade.
Her sister (are / is) in the ninth grade.
Her sister (is) in the ninth grade.