題：Being left alone at home made the boy really annoyed.

疑問：為何不需要Left 而用Being left ?

doing 為動名詞主動形式

being done為動名詞被動形式

備注：動名詞是非謂語動詞可以作句子：主語，賓語，表語，同位語，定語，補語

He is left alone at home

分析：is left為謂語動詞，只能作句子謂語成分

He doesnt like being left alone at home

分析：being left alone at home為非謂語動詞（動名詞短語）作句子賓語成分

Being left alone at home made the boy annoyed

分析：being left alone at home為非謂語動詞（動名詞短語）作句子主語成分

備注：

being left alone at home為動名詞短語，可以作句子主語，賓語，表語等成分

left alone at home為過去分詞短語，只能作句子狀語，定語等成分，不可以作句子主語成分，所以不可以去掉“being”