Question

CORRECT THE MISTAKES IN THE FOLLOWING SENTENCE. THERE ARE MORE THAN TWO.
That childrens have studied french since they have 10 years old.

Answer 1

THE CHILDREN HAVE STUDIED FRENCH SINCE THEY WERE TEN YEARS OLD

Answer 2

Explanation:

That children not childrens have studied French since they had not have 10 years old.

these are two faults...

childrens become children

have become had