1.是are always busy.构成主系表结构。busily是副词，修饰动词或者是形容词。例句：We are always busy.我们总是很忙碌。He often Works busily.他总是很忙碌的工作。

2.busy 是形容词忙碌的。类似的还有kind clever hard_working helpful

3.Our teacher is strict.