推量副詞「たしか」と「たぶん」の意味機能

Abstract

This paper aims at revealing the features of the Japanese adverb “tashika”, focusing on the grammatical and semantic sides of it. “tashika” is one of the epistemic adverbs such as “tabun” and “osoraku”. However, “tashika” has the usage of memory regeneration, but the others don’t. We, human beings cannot memorize the every information about the events that we have experienced, so when “tashika” is used in the sentences, it contains the speaker’s uncertain attitude for the event. Grammertically, “tashika” is often used in the Noun-predicate sentences , and it comes with past tense when you want to focus on the past which the event has taken place, or non-past(present) tense when you focus on the speaking time. When it comes to sentence-end expressions, “tashika” is often found in the assertive sentences, and co-occur with epistemic modal predicates such as “hazu-da” and “to-omou”. Finally, “tabun” has the usage of memory regeneration, but tabun is mainly used as an inferred usage.