Affixes are the morphemes that are added.

Kinds of Affixes

Prefixes

An affix that goes before a root.

/hɪˈstɔːrɪk/ + /priː-/ = /ˌpriːhɪˈstɔːrɪk/

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Suffixes

An affix that goes after a root.

/kaɪnd/ + -/nɛs/ = /ˈkaɪndnɛs/

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Infixes

An affix that goes inside a root.

(Tagalog) /sulat/ + -/um/- = /sumulat/

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Circumfixes

An affix that goes around a root.

/laɪt/ + /ɛn/-...-/ən/ = /ɛnˈlaɪtən/

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