What the element ‘-es’ indicates is third person singular, present tense, the element ‘-ed’ past tense, and ‘-ing’ progressive aspect. Since they are the smallest unit of language and meaningful, they are also（）.

A general difference between phonetics and phonology is that phonetics is focused on the production of speech sounds while phonology is more concerned with how speech sounds distinguish meaning.

Duality

inflectional morphemesn

In modern linguistic studies, the written form of language is given more emphasis than the spoken form for a number of reasons.

protolanguage

According to the ways antonyms differ, how many groups can we classify antonyms into?

Give the description of the following sound segments in English.[k];[z];[w];[u:];[i]

Describe the process of language perception，comprehension and production.

Of the three branches of phonetics, the longest established, and until recently the most highly developed, is（）phonetics.