In a passage I encountered:
To an inattentive reader, the expressions,
- “I am the man, who commands you”
- “I am the man, who command you”
may appear to be precisely equivalent. This, however, is by no means the case —(See “The Etymology and Syntax of the English Language explained,” p. 261, fourth Edition.).
I could not find the 4th edition of the referred book, and unfortunately not sure I understand the difference here.