The abessive expresses the lack of something. It often corresponds to the preposition without. The abessive suffix is -tta/-ttä in both the singular and in the plural.
The comitative expresses the presence of something. It often corresponds to the preposition with. The comitative suffix is -ne in the plural. The comitative does not occur in the singular, but plural forms are used instead, even if the meaning is singular. The nouns require a possessive suffix as well.
The instructive expresses the means or the instrument used to perform the action. It often corresponds to the preposition with. The instructive suffix is -n in both the singular and in the plural. Singular forms are not very common.