[header] How to oppose a demurrer to a complaint [title] Read the demurrer. [step] In a demurrer, the defendant will claim that your complaint is legally deficient. Typically, the defendant will argue that you failed to sufficiently allege a cause of action by leaving out a required element. 
[substeps] Take out your complaint and read it side by side with the defendant's demurrer. Check to see if the defendant has accurately summarized your complaint.