Hi, there.<br/><br/>Here is a sentece I am wondering.<br/><br/><b>What I know about him (is/are) unusally bad things.</b><br/><br/>Can I use the verb 'are' in this sentence?<br/><br/>I mean... Can I consider what-relative clauses plural? or is '<b>What I know about him'</b> always singural? I'm confused....