Directions: In the following questions, some of the sentences have errors and some have none. Find out which part of a sentence has an error. The number of that part is your answer. If there is No error, the answer is (4). 

Q:

The ebb and flow of the tides (1)/ are (2)/ now understood (3)/. No error (4) 

• 1
  1
• 2
  2
• 3
  3
• 4
  4