"Geography is good"

Translation: Somo la Jiografia ni zuri

[danieljbuyinza]

How do I know when to say zuri instead of nzuri?

[machieng]

if it's just 'Jiografia' then you'd say 'nzuri' since it's in the noun class N/N. Since it's referring to 'somo', which is in the noun class Li/Ya (or Ji/Ma, depending on who you ask), it's 'zuri'