1. Morphonology: it is concerned with the internal organization of words. Also it can be dissected into two parts, morpheme and word-formation processes.

2. Morpheme: it refers to the smallest unit of language which has its own meaning.

   
   

Classification of words

1. Lexical/open-class/invariable words: noun, adjective, verb and adverbial. It carries the main content of language. Its membership is infinite and unlimited.

2. Functional/closed-class/variable words: preposition, pronoun, article and conjunction. It connects different parts of language together.

Derivational morpheme: it is attached to other morphemes to create a new word.

Inflectional morpheme:

Derivational morpheme can change the grammatical category of a word.

Inflectional morpheme can change the grammatical function of a word.

Morph and allomorph

Morph: it refers to the smallest unit of language which has its own meaning and utterance.

Allomorph: it refers to a set of morphs which represent the same morpheme.

For example: plurality? book+plural ?bus+plural? sheep+plural…

The allomorphs of the plural form morphemes are: {-s, -z, etc}

Other language (Page72)

We should pay heed to the novel phrases and expressions and imitate them!