What is the difference between σε and σένα?
I also found "εσένα". Is σένα a shortened form of it?

Question

Answer

As far as I know : "σε" means "you" - accusative case.    "εσένα"  is also "you"  accusative ,  but it's an additional form used for emphasis .

"σε  βλ'επω"  =  " (I)  see you "
"εσένα  σε  βλέπω"  =  "(I) see you"   .    Both sentences mean basically the same, but the second one has some extra emphasis  (I see you,  not someone else) .      But it's incorrect to use "esena"  alone ("εσένα  βλέπω"  would be incomplete).

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