In the book Great Expectations, explain Pip's feelings about his sister's death when he returns to the forge and sees Biddy and Joe.Charles...

Pip learns of the death of his sister in Chapter XXXV of
Great Expectations; her end comes some time after she has been
attacked by an unknown assailant.  Pip narrates,

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It was the first time that a grave had opened in
my road of life, and the figure of my sister in her chair by the kitchen fire haunted me
night and day....But I suppose there is a shock of regret which may exist without much
tenderness.

While Pip has not
had a close relationship with his sister, who has brought him "up by hand," Mrs. Joe,
nevertheless, is his only family.  Thus, with her death, Pip senses a "grave open"
before him which takes from him his only relative and, with her, part of his identity. 
Unknowingly, perhaps, Pip feels himself again an orphan--an image which pervades
throughout Great Expectations as well as other works
of Dickens.

The image of shadows also pervades this chapter
as Pip senses the end of his halcyon life with Joe as a child.  He describes his sister
being laid quietly to rest,

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while the larks sang high above it and the light
wind strewed it with beautiful shadows of clouds and
trees.

When they return from
the funeral, Pip talks with Biddy as the "shadows of evening" close in upon them. 
Proudly, Pip berates Biddy for not having written him (he learned of Mrs. Joe's death
from Mr. Trabb).  And, he asks Biddy what she will do after the day; she tells him that
she will work at a school.  Then, Biddy cries as she relates the last words of Mrs.
Joe:  She said "Joe" and once "Pardon"; then she said "Pip."  After this, Biddy looks
towards a dark tree, for she has seen Orlick walking near it of an evening.  At this
revealation, Pip is angered that Orlick stalks her; he promises to visit Joe, but Biddy
wisely questions him "with an honest eye."  For, Biddy knows that Pip has becomes too
affected, but he feels injured that she does not believe
him.

On the next day Pip departs after shaking the
blackened hand of Joe, promising to visit because he knows that Joe will be lonely. 
Significantly, Pip notices the

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glow of health and strength upon his face that
made it show as if the bright sun of the life in store for him were shining on
it.

Here Dickens suggests
that like the shadows of the previous evening, Pip's life will become overcast with
gloom as will the lonely Joe's; however, when he returns to the forge, there will be the
health and strength of Joe waiting and the "bright sun" of life and love will comfort
Pip.  But, unwittingly, Pip leaves and returns to his shadowed life where he and Herbert
will go "from bad to worse" as Pip essays to advance himself socially.  This desire for
self-improvement impinges upon the honor of Joe and Biddy, but Pip does not consider
them.  Only when he sees them does he feel
guilty.