Why is the Giant called selfish?

On one occasion the children said: "How happy we are here!"

Later they said: "How happy we were there!"

What are they referring to in both the cases?

(i)  When spring came, it was still winter in the garden. What does winter stand for or indicate here?
(ii) Winter has been presented like a story with its own characters and their activities. Describe the story in your own
words.

Was the Giant happy or sad over the state of the garden?

What effect did the linnet's song have over Hail and the North Wind?