Past perfect continuous

Functions of the past perfect continuous

The past perfect continuous corresponds to the present perfect continuous, but with reference to a time earlier than 'before now'. As with the present perfect continuous, we are more interested in the process.

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Examples

Had you been waiting long before the taxi arrived?
We had been trying to open the door for five minutes when Jane found her key.
It had been raining hard for several hours and the streets were very wet.
Her friends had been thinking of calling the police when she walked in.

This form is also used in reported speech. It is the equivalent of the past continuous and the present perfect continuous in direct speech:

Jane said, "I have been gardening all afternoon." = Jane said she had been gardening all afternoon.
When the police questioned him, John said, "I was working late in the office that night." = When the police questioned him, John told them he had been working late in the office that night.

Forming the past perfect continuous

The past perfect continuous is composed of two elements - the past perfect of the verb to be (=had been) + the present participle (base+ing).

Subject	+had been	+verb + ing
I	had been	walking
Affirmative
She	had been	trying
Negative
She	hadn't been	sleeping
Interrogative
Had you	been	eating?
Interrogative negative
Hadn't they	been	living?

To buy, past perfect continuous

Affirmative	Negative	Interrogative
I had been buying	I hadn't been buying	Had I been buying?
You had been buying	You hadn't been buying	Had you been buying?
She had been buying	She hadn't been buying	Had she been buying?
We had been buying	We hadn't been buying	Had we been buying?
They had been buying	They hadn't been buying	Had they been buying?