Some lawyers are not crooks. Light rays travel at a fixed speed. Not all convicted murderers get the death penalty. Some students don't work very hard. A categorical proposition is in standard form only if it is expressed in one of the following four forms denoted by bold lettering.
All children are innocent.
Every living thing needs nourishment. Dogs are mammals. Each student has to do a term project. Any dimwit can tell you who the President is. The students are all getting frustrated.