改错题 Are their art teacher drawing pictures in the classroom

Are their art teacher drawing pictures in the classroom?
可以改成：1. Is their art teacher drawing pictures in the classroom?
2. Are their art teachers drawing pictures in the classroom?
His classmates watching ants on the grass now.
改成：His classmates are watching ants on the grass now.
希望采纳

Are their art teachers drawing pictures in the classroom?
His classmates are watching ants on the grass now .

IS their art teacher drawing pictures in the classroom. 主语为单数,所以are改成is
His classmates are watching ants on the grass now 主语是复数,把is改成are

are ----Is
watching前面加are