Grupo de adjetivos con 2 o más formas de comparación

Some adjectives have two possible forms of comparison

common /commoner / more common/commonest / most common

likely/ likelier / more likely / likeliest / most likely

pleasant/ pleasanter / more pleasant/pleasantest / most pleasant

polite/politer / more polite/ politest / most polite

simple simpler / more simple/ simplest / most simple

stupid /stupider / more stupid/ stupidest / most stupid

subtle/ subtler / more subtle /subtlest

sure / surer / more sure / surest / most sure

http://www.englisch-hilfen.de/en/grammar/adjektive_steig.htm

Escucha el audio de estas palabras en el siguiente enlace

http://fromtexttospeech.com/texttospeech_output_files/0089315001431544257/6203970.mp3
http://fromtexttospeech.com/texttospeech_output_files/0089315001431544257/6203970.mp3
http://fromtexttospeech.com/texttospeech_output_files/0089315001431544257/6203970.mp3