SVA Rule #4. 

An essential adjective clause begins with that or any other relative pronouns and is not set off by commas, but the verbs it contains must still agree with their subjects. Essential adjective clauses can be removed without causing any major grammatical problem.

The man who left his wallet is coming back for it.

The time when I go to bed changes in the summer.

The dog that I brought home from the pound was soon fast asleep.

The way that you’re wrestling those alligators is causing them some distress.

The sailing vessel that is engraved on the Canadian dime is the famous schooner Bluenose.

 Example #8. 

Find the main subject and verb by removing the essential adjective clause.

Fruit that is grown organically is expensive.

Students who are intelligent get good grades.

Those people whose names are on the list will go to camp.

Eco-friendly cars that run on electricity help the environment.

The store where the new phone was being sold had a huge line of people outside it.

 

Click to see the correct answer Fruit that is grown organically is expensive.
Students who are intelligent get good grades.
Those people whose names are on the list will go to camp.
Eco-friendly cars that run on electricity help the environment.
The store where the new phone was being sold had a huge line of people outside it.

 

 Example #9. 

Green tea is a beverage that is long been used as a form of medicine in many countries.

  1. NO CHANGE
  2. are
  3. has
  4. have

 

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