作表语的形式很多，常见的主要有——

名词，代词，形容词，副词，不定式，现在分词，过去分词，介词短语，从句等。例如

Tom is a top student.

The book is mine.

It is fine today.

He is out.

My dream is to pass the college entrance examination.

Seeing is believing.

We are excited at the good news.

It looks in good state.

What is known to all is that China is still a developing country.