English has between two and four levels of morphology in the lexicon. The levels within the lexicon are ordered so that, to get to Level 3 from Level 1, a word must pass through Level 2. A word cannot go back to a previous level once it has left one level and gone on to another level.Halle and Mohanan propose the following four levels of morphology in the lexicon:
- Level 1: Class 1 derivation, irregular inflection
- Level 2: Class 2 derivation
- Level 3: Compounding
- Level 4: Regular inflection
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