[Grammar] He is TALLER/MORE TALL than I am.

[Sahil Dhankhar]

This is not my homework.

I think that when a comparative degree of an adjective is possible by adding "er/ier" then we should use only the "er/ier" form and should not use comparative form by adding more to the positive degree of the adjective.

Therefore
He is taller than I am. (correct)
He is more tall than I am. (Incorrect)

Am I right?

P.S.- However when comparing two qualities of a same noun, we should use only the comparative form by adding more to the positive degree of the adjective.
Example:- He is more tall than handsome. (correct)
He is taller than handsome. (incorrect)

 

[GoesStation]

Both assertions are, I think, correct.

 

[Tdol]

With two-syllable adjectives, you will come across cases where both forms are used- commoner/more common, etc.