Dual number,as a special kind of plural number,hardly attracts attention although English grammar about number is so self-contained.Dual case,once an important grammar category in Old English,now has vanished in English language.A contrast was made in English and Chinese dual conceptualized nouns,verbs,prepositions,pronouns,quantifiers and affixes.It is supposed that cultural and philosophical facors do bring the common and diversed forms of dual concepts in the two languages.
