Some one pls explain to me when to use "me" and "I".

Ok, here’s the X’ structure for “to never split infinitives” (simplified, and quite dependent on how much of my syntax class I remember):



     I'__
    /    \
  Iº     _VP___
   |    /      \_
  to  AdvP       V'_
       /_\       |  \
      never      Vº  NP
                 |    /_\
             split   infinitives


“never split infinitives” is a verb phrase; “split infinitives” is a verb sub-phrase, and “split” is the head of the verb phrase. “To” is the head of the inflectional subphrase (never mind), whose structure is [Iº VP]. So it’s fine to put the head of the inflectional phrase (“to”) before the verb phrase (“never split infinitives”).

(In fact, I’m having a little difficulty figuring out how to draw a tree for the supposedly more proper “never to split infinitives”, so I won’t bother. Also, drawing syntax trees in this is a pain in the ass.)