Question

2. Teachers are working hard for the examination. (Past Perfect
Tense)​

Answer 1

Answer:

Teachers had been working hard for the examination

Answer 2

Answer:

Teachers had worked hard for the examination .

Explanation :

For your information...Note down the following for example

• Have worked - Present perfect tense

• Have been working - Present perfect

continuous tense

• Had worked - Past perfect tense

• Had been working - Past perfect continuous tense