Verbs of different types
Sanskrit has ten classes of verbs divided into in two broad groups: athematic and thematic. The thematic verbs are so called because an a, called the theme vowel, is inserted between the stem and the ending. This serves to make the thematic verbs generally more well-behaved. Exponents utilized in verb conjugation include prefixes, suffixes, infixes, and reduplication. Also extremely common is vowel gradation; every root has (not necessarily all distinct) zero, guna, and vrdhii grades. If V is the vowel of the zero grade, the guna grade vowel is traditionally thought of a V + a, and the vrdhii grade vowel as V + aa.
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