Why does Lois Lowry use so many flashbacks in the narration of the giver?

What does hofmann use of the pronoun it imply about the sister feeling about gregor

Ivansanger rainsfordgeneral zaroffwhitneyadventurous hunter; calm and composed; considers himself a realist; new yorker; veteran of world war ia hunter; sympathetic to the plight of voiceless, defenseless animals; cautiouscossack; mute; formidable physical stature; wears a black uniform; used to whip prisoners for the great white czarcossack; aristocrat; has sharp, pointed teeth and red lips; devoid of humanity and emotion

Ispeak without a mouth and hear without ears. i have no body, but i come alive with wind. what am i?