The present tense can be expressed in imperfective verbs only.

In order to express such an action or state, imperfective verbs are used.

They are formed from other imperfective verbs by stem alternations or suppletion, ex.

Other iteratives build another group of mono-aspectual imperfective verbs.

In morphology, the future tense of imperfective verbs was fixed.

The present tense of the Macedonian language is made of the imperfective verbs.

In Ukrainian, there are 2 different future tenses for imperfective verbs.

Both imperfective and perfective verbs have such tense (there is no difference in their conjugation).

Initially, it was used with both perfective and imperfective verbs.

There are two present active participles, which are used with imperfective verbs.