Be动词后面到底加什么,为什么He is funny,加形容词可以,It was exactly what I need

1。be + 名词 This is a bal2。be + 形容词 It's beautiful3。be + 副词（副词用来修饰be 动词）+名词（实际上接的还是名词）It is exactly what I say。4。be + to It is to rain。(表示即将发生） You are to be a hero。(表示必定发生） 你注定要成为一个英雄。 You are to be the king。 你注定要成为国王。