asking for explanation

[najmas]

can I say:"He is taller than her." or "He is taller than she."

[Soup]

Hi najmas

He is taller than her.
He is taller than she (is).

[mara_ce]

"He is taller than her." Right
"He is taller than she." Wrong. You can say: "He is taller than she is."

[najmas]

hi Mr. soup
I don't think "he is taller than her" is correct because "than" is not a preposition, or this is what I was told

[najmas]

"He is taller than her." Right
"He is taller than she." Wrong. You can say: "He is taller than she is."

That's it. You are totally right, or I think so

[bhaisahab]

can I say:"He is taller than her." or "He is taller than she."

"He is taller than her."

He is taller than she (is)." Strictly speaking only this is correct, but both are in common use.

[Coronet Hall]

From a very strict standpoint it should be "taller than her" because you are comparing a subject with the object of the sentence, thus using an objective pronoun (her) to compare. In everyday usage it is also commonly acceptable to say "taller than she" as an incomplete sentence but complete idea. You could be comparing one subject to the subject of a second clause impling: "taller that she (is)".

Don't worry, this has been an ongoing argument within the academic community.

Hope it helps.