情态动词后，用原型
如:Then you must be my cousin
That will be his wife with him, I suppose.
To be 成为
如:We reckon him to be the best goalkeeper in the world
不及物动词 to be
This feeling seems to be natural
The rumour proved to be false
词组短语
so be it: 诚心所愿；顺其自然
let be: 听任；不干涉，不打扰
主系表结构的语句常使用，此时它是系动词。当然也可以单另当作动词来使用。例如，Be quick.
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