The れんようけい連用形 (conjunctive) is a fundamental form of Japanese verbs, used as a base for various grammatical constructions and expressions.
Polite form (~ます): The verb stem combines with ~ます to create the polite form.
Noun form (Nominalization): The verb stem can function as a noun (e.g. はなし話し meaning "a story" or "talk") or combine with other nouns.
Combination with auxiliaries: Verb stems are used with auxiliaries like ~たい (want to do) and ~すぎる (too much).
Creating compound verbs: Verb stems can combine with other verbs to form compound verbs like ~始める (begin) and ~終わる (finish).
Connecting Sentences: The verb stem is used to connect two clauses or sentences. It creates a smooth flow of actions, often implying "and" or "after that". This is especially common in written language.
This usage gives a more formal or literary tone compared to the casual て-form for connecting actions.