Past perfect focuses on the RESULT of the action

Examples: She had finished her h.w BEFORE her parents arrived

KEY EXPRESSIONS:

-Before

-After

-By the time

-Already

-Just

Function: It is used to describe an action that was ONGOING before abother PAST ACTION

Past Perfect Progressive focuses on the DURATION of the action

Example:

She has been studying for hours BEFORE she took a break

IMPORTANT: We need to pay attention on the order & duration of the eventes

KEY EXPRESSIONS

-For

-Since

-Before

-When

-Until

1. She had finished her homework before dinner.

2. They had already left when we arrived at the party.

3. He had never seen the ocean until last summer.

3examples past perfect progressive

1. They had been studying for three hours when the exam started.

2. She had been working at the company for five years before she got promoted.

3. He had been playing soccer before he got injured.