m- / mi- (kivumishi)

The m-/mi- adjective agreement pattern is a core rule for Class 3 and 4 nouns. These classes contain trees, plants, body parts, and many inanimate objects.

1. Consonant Stems
For variable (Bantu) adjectives starting with a consonant, simply attach m- for singular and mi- for plural:

• -zuri (good) → mti mzuri (good tree) / miti mizuri (good trees)
• -kubwa (big) → mji mkubwa (big city) / miji mikubwa (big cities)

Note that monosyllabic adjectives are completely regular in Class 3/4 (e.g., -pya → mti mpya / miti mipya).

2. Vowel Stems
When an adjective starts with a vowel, the prefixes change to ensure smooth pronunciation:

• Singular (Class 3): m- becomes mw- before most vowels (e.g., -eusi → mweusi), but before 'u', the prefix remains m- (or mu-) (a less frequent boundary than the common mweusi pattern).
• Plural (Class 4): mi- can become my- or remain mi- before 'e', 'a', and 'o' (e.g., -epesi → myepesi or miepesi). Before 'i', the vowels merge (e.g., -ingi → mingi, -ingine → mingine). Before 'u', it remains mi- (learn the actual adjective and meaning rather than forcing a human sex adjective onto an inanimate noun).

Contrast Note: Learners often confuse the singular and plural forms of -ingi and -ingine. In the singular, they are mwingi and mwingine. In the plural, they are mingi and mingine.

3. Invariable Adjectives
Many borrowed adjectives (like safi or ghali) are invariable and take no prefix at all.

Important Distinctions:

• Class 1 vs. Class 3: Class 1 adjectives also use m- in the singular (e.g., mtu mzuri). You can tell them apart in the plural: Class 1 takes wa- (watu wazuri), while Class 3 takes mi- (miti mizuri).
• Verbs and Possessives: Do not use m-/mi- on verbs or possessives! Class 3/4 uses u-/i- for subject markers and w-/y- for possessives (e.g., mti wangu umeanguka / miti yangu imeanguka).

Position and Number:
A descriptive adjective normally follows its noun: miti mirefu (tall trees). Context can change modifier order for emphasis, so “always” is too strong. Variable numerals also agree: miti miwili (two trees), miti mitatu (three trees), miti minane (eight trees). Use semantically ordinary descriptions such as mti mweusi and miti myeusi to practice the vowel boundary.