4.2 Morpheme: the minimal meaningful unit of language

4.3 Classification of morphemes

　　4.3.1 Free and bound morphemes

　　4.3.2. Inflectional and derivational morphemes

4.4 Formation of English words

　　4.4.1 Derivation

　　4.4.2 Compounding

　　4.4.3 Other types of English word formation