Hello,
1. She is taller than me.
What is the function of "than" here?
Is it a conjunction or preposition or esle?
conj
She is taller than me (I am)
She is taller than I am -- than is a conjunction
she is taller than I (am) -- than is a conjunction with ellipsis; rather formal
she is taller than me -- than as a preposition
(taken from CGEL)