Accidentally dropped the glass on the floor
Incorrect; There isn't any subject
The whales headed south for the winter
correct
Walking with the children to school
Incorrect; no subject and incomplete verb
My best friend always helpful with problems
Incorrect; there isn't any verb. the verb should be 'be' (is)
The bus schedule has changed since last week
correct
The customer paying the clerk for the clothes
Incorrect; Incomplete verb
Each day practice the piano for hours
Incorrect; there isn't any subject
The professor handed the syllabus to the students
correct
The new student in the class very talkative and friendly
Incorrect. there isn't any verb
The basketball player tossed the ball into the hoop
Correct