大学英语四级语法精要：主语从句之一 what引导的从句

由what等代词引导的主语从句: what表示“…所…的(东西)”, 在结构上等于一个名词加一个定语从句; whatever表示“所…的一切”; whoever表示“一切…的人”. What you need is more practice What is hard is to do good all one’s life and never do anything bad. Whatever was said here must be kept secret. Whatever I have is at your service. Whoever comes will be welcome. Whoever fails to see this will make a big blunder.