SVA Rule #1. 

All verbs must agree with their subject in number; it means singular subjects take singular verbs, and plural subjects take plural verbs.

A cluster of grapes was hanging just out of the fox’s reach.

The trolls who lurched along the corridors were looking for the loo.

 Example #1. 

Yesterday, I saw a cluster of grapes is hanging just out of the fox’s reach.

  1. NO CHANGE
  2. was
  3. were
  4. are

 

Click to see the correct answer Correct answer is choice B.

 

Example #2. 

The trolls is looking for the loo two hours ago.

  1. NO CHANGE
  2. was
  3. were
  4. are

 

Click to see the correct answer Correct answer is choice C.