Does the past perfect talks about the past in the past?

I _____ the work when she arrived.

He told me that they _____ a new car with their savings.

Unlike the present perfect, in the past perfect the action started in the past and continues to the...

Is the past perfect often used with an adverb?

___ the snake ___ on his leg?

When I arrived at the cinema, the film ____ already ____.

For negative sentences, do we write NOT between the auxiliary verb and the main verb?

Past perfect cannot be used in conditional sentences.