be - 意思，英文例子

助动词 “be”

 不定式 be; 我 am, 'm; 你 are, 're; 他 is, 's; 过去式 were / was; 过去分词 been; 动名词 being

 negative: he isn't, past wasn't; you aren't, past weren't

与动词的过去分词一起使用，构成被动语态。
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The cake was eaten by the children. Another one will be baked by their mom tomorrow.
用于与动词的现在分词连用，构成进行时态。
She is running a marathon this weekend. She was preparing for it yesterday.
表达义务或意图的正式方式
You are to complete your homework before playing video games.

 不定式 be; 我 am, 'm; 你 are, 're; 他 is, 's; 过去 were / was; 过分词 been; 动名词 being

 否定“to be”：他 isn't，过 wasn't；你 aren't，过 weren't

是 (连接主语和名词)
She is a doctor. The animal is a cat.
是（连接主语和特定的性质或状态）
The cat is fluffy. This was quite strange. Helping others is as important as taking care of yourself.
存在
There is a chance of rain this afternoon.
有...岁
My sister is 15 years old.
是
It is 10:30 in the morning.
过去了...时间
It has been five minutes since the last call.
是（用来描述天气的）
It is very windy today.
在
The keys are in the drawer.
是什么时候
When will the concert be?