Tense : - The tense of a verb in a sentence expresses time the event has occurred. There are three tenses of a verb: Present, Past and Future: time now, time then and time to come.

Past Perfect Continuous Tense:

Past Perfect Continuous Tense expresses an action that began before a specific time in the past and continued till that time.

Example:

• When Sam joined the company last year, his friend had already been working there for three years.

In the question : -

1. They ________________  in New York for four years when they had to leave due to personal reasons.

In this sentence , the correct form of tense that can be placed in the blank part is had been living as it is used to show an action that began before a specific time in the past and continued till that time.

2. Theena _____________  for an hour before her mom arrived.

In this sentence , the correct form of tense that can be placed in the blank part is had been singing as it is used to show an action that began before a specific time in the past and continued till that time.

Thus , the Correct Option is D , which is Had been living , Had been singing .

Tense : - The tense of a verb in a sentence expresses time the event has occurred. There are three tenses of a verb: Present, Past and Future: time now, time then and time to come.

Past Perfect Continuous Tense:

Past Perfect Continuous Tense expresses an action that began before a specific time in the past and continued till that time.

Example:

• When Sam joined the company last year, his friend had already been working there for three years.

In the question : -

1. He _____________  milk out the carton when Mom walked into the kitchen.

In this sentence , the correct form of tense that can be placed in the blank part is had been drinking as it is used to show an action that began before a specific time in the past and continued till that time.

2. I ___________  at the company for five years when I got the promotion.

In this sentence , the correct form of tense that can be placed in the blank part is had been working as it is used to show an action that began before a specific time in the past and continued till that time.

3. The program that was terminated ___________  well since 1945.

In this sentence , the correct form of tense that can be placed in the blank part is had been working as it is used to show an action that began before a specific time in the past and continued till that time.

Thus , the Correct Option is A , which is Had been drinking , Had been working , Had been working .

Tense : - The tense of a verb in a sentence expresses time the event has occurred. There are three tenses of a verb: Present, Past and Future: time now, time then and time to come.

Past Perfect Continuous Tense:

Past Perfect Continuous Tense expresses an action that began before a specific time in the past and continued till that time.

Example:

• When Sam joined the company last year, his friend had already been working there for three years.

In the question : -

1. Do you know for how long Anitha ____________  at the college before she moved to Pollachi?

In this sentence , the correct form of tense that can be placed in the blank part is had been working as it is used to show an action that began before a specific time in the past and continued till that time.

2. Asha was completely exhausted as she _________  continuously for three days.

In this sentence , the correct form of tense that can be placed in the blank part is had been traveling as it is used to show an action that began before a specific time in the past and continued till that time.

3. My cousins _____________  that we called the police when we found the burglars.

In this sentence , the correct form of tense that can be placed in the blank part is had been suggesting as it is used to show an action that began before a specific time in the past and continued till that time.

Thus , the Correct Option is C, which is Had been working , Had been traveling , Had been suggesting .