it is后面加什么词性

it is后面加形容词或者名词都可以，再高级一点，加从句也可以。例It is a dog. It is beautiful. It is exactly what I want. 另外It is.that.也可以表示强调句。

例句

It is an impressive achievement.

这是一项令人敬佩的成就。

It is cylindrical in shape.

它是圆柱形的。

It is a purely academic question.

这是一个纯理论问题。

Does it matter what colour it is?

它是什么颜色重要吗？

It is important not to skip meals.

重要的是，不能不吃饭。