I gave him what help I could.
我给他任何我能给的帮助。
What is required is some good books.
第一句中what后跟is，固required后的谓语动词用单数is。第二句中what后跟are，固required后的谓语动词用复数are。
I do not know what he is and does.
我不知道他是谁，也不知道他做什么。
What I am interested in you may not be interested in.
我感兴趣的，你可能不感兴趣。
He asked me what I wanted. (疑问代词)
He gave me what I wanted.(关系代词)
He went, and, what is more surprising, actually won the prize.
他去了，而且更令人惊讶的是，他还获奖了。
He sent me books, magazines, newspapers, pictures, and what not.
They were then generally dirty, ignorant, superstitious, and what not.
He is a professor of physics.
前两句的回答是正确的，但是第三句不可以。
邮箱： 