Modal verbs in Afrikaans grammar are essential when expressing certain moods, such as necessity, possibility, or permission. They are auxiliary verbs that are used with main verbs to add additional meaning or emphasis. Some common Afrikaans modal verbs include “kan” (can), “mag” (may), “moet” (must), “wil” (want), and “sal” (shall). Understanding and using modal verbs correctly is important in mastering the Afrikaans language.