be动词:包括助动词be和系动词be
be是(am, is,are, was, were, being, been)的原形
(1)当谓语动词第1位置出现,情态动词,表示将来时态助动词,后面用be
Can it be true?
It can't be yours.
It must be hers.
She may be at home.
He will be in Beijing in five days
Tom's mother will be unhappy when she hears the news
Mary is going to be a doctor.
(2)不定式后面逻辑表语,用be
She wants to be an actress.
Tom pretended to be asleep.
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