Imperfective Stems

Some articles on imperfective stems:

Bulgarski - Grammar - Verbal Morphology and Grammar - Non-finite Verbal Forms
... is formed from imperfective stems with the addition of the suffixes –ащ/–ещ/–ящ (четящ, 'reading') and is used only ...

Famous quotes containing the word stems:

    One who pressed forward incessantly and never rested from his labors, who grew fast and made infinite demands on life, would always find himself in a new country or wilderness, and surrounded by the raw material of life. He would be climbing over the prostrate stems of primitive forest-trees.
    Henry David Thoreau (1817–1862)