In a simple sentence, Tamil verbs are usually found in one of two forms---FINITE or NON-FINITE. Finite verbs are complete as they stand; non-finite forms require some additional suffix, another clause, or another syntactic construction to make the sentence they occur in complete and grammatical. Finite verbs usually end a sentence; non-finite verbs never do.
The simplest form of the verb is called the stem, and verbs are listed in most dictionaries in the stem form. It is identical to the simple imperative in most cases.