be是be动词,有多种形式
人称单数转为is ,复数转为are
第一人称单数是am
eg.
I am able to swim 我会游泳
We are able to swim 我们会游泳
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第一人称用am 如:I am able to sing english songs.
第二人称或复数时用are,如:you/they/we are able to sing english songs.
第三人称用is,如:he/she is able to sing english songs.
在前边有情态动词/助动词时用be, 如:I can/will be able to sing english songs.
主语是i.的时候用am,主语是you或者复数的时候用are,主语是它他她的或者单数时候用is,be就是他们三个的统称,不用be
一般现在时用am/ is /are. 如:
I am able to sing the song.
He is able to speak English.
We are able to finish the work on time.
如与助动词连用时,用be, 如:
He will be able to win the match.