be动词可以分为以下2类
(1)系动词be: 后面接“名词,代词,数词,形容词,副词,介词短语,动名词,不定式,从句” 作表语。
China is a developing country.
Tom's mother is beautiful.
Jack's father is a doctor.
They are from America.
We are here
备注:系动词be+表语=构成句子谓语成分
(2)助动词be:后面接现在分词构成进行时态,后面接过去分词构成被动语态。
Mike is playing basketball
The vase was broken by Tom.
备注:助动词be+现在分词/过去分词 构成句子谓语成分。
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