コアイメージは「在る」

働き
動詞と助動詞

動詞
である、にある、にいる

I am lucky.
This desk is in the room.
He is at home.

be動詞の語形変化
 
[現在形、過去形]
一人称単数  I am,I was
一人称複数  We are,We were
二人称単数  You are,You were
二人称複数  You are,You were
三人称単数  He is,He was
                  She is,She was
                  It is,It was
三人称複数 They are,They were
 
[過去分詞、現在分詞]
人称全て   been,being

英単語カンタン記憶ソフトV6000