10. the whales headed south for the winter »» WRONG, because "the whales" is the subject,but the verb is wrong,and "for the winter" is the object of proportition.
the right answer is »» the whales were south for the winter

8. in a moment of worry about the problem with the cash in the account. »» WRONG, because there is no verb. the subject is "the problem". the right answer is »» in a moment of worry about the problem paid with the cash in the account.


Remedial Exercise »»»
exercise A :
2. each day practiced the piano for hours »» WRONG, because the verb is wrong. the subject is "the piano", and "for hours" is object of proportition.
the right answer is : each day practices the piano for hours.

8. walking with the children to school. »» WRONG, because the verb is wrong. the subject is "the children" and "to school" is object of proportition.
the right answer is »» the children is walking to school.

exercise B ::
9. the plane from New York circling the airport »» WRONG, because the verb is wrong. the subject is "the plane".
the right answer is : the plane from New York is circling the airport.

10. on a regular basis the plants in the boxes under the window in the kitchen are watered and fed »» WRONG, because the verb is wrong. the subject is " the plants".
the right answer is : on a regular basis the plant in the boxes under the window in the kitchen are watering and fedding.