Two classes of verbs can be differentiated on the basis of their behaviour in aspectually marked sentences. One class of verbs has two aspectually distinct forms, as seen in the above example sentences. Another class of verbs does not distinguish aspect—one and the same form shows up in both completive and continuative aspect. In sentences in the recent past tense, this gives rise to ambiguity since the preverbal continuative particle is omitted there. Thus, the sentence "kòfí blú" can be interpreted in the following two ways: