1. Her lips is thin. __is-> are___
2. She's weak. She_not strong. (Thiếu) is___
3. Is your mother hair long or short? your mother -> your mother's
4. My sister have an over face. have -> has
5. What color are her hair? are -> is
6. Lan, a student in grade 6, is eleven years old. She is old. old -> young