The Japanese Polite and Plain Style Quiz is a free web app for practicing the difference between desu/masu style and da/de aru style.
Learners can identify sentence endings, rewrite into polite style, rewrite into plain style, keep a paragraph consistent, and choose a style that fits the writing situation.
All questions, answer choices, explanations, diagrams, and short example sentences in this app are original practice materials created for this quiz.
The quiz is designed for learners who are beginning to notice how Japanese writing changes depending on audience, purpose, and sentence endings.
The example sentences are short and original, so learners can focus on Japanese sentence endings without relying on copied textbook passages.
Hints change according to the current question. They show the key sentence ending, the style pair, and a simple original diagram for conversion or consistency.
For example, verb questions focus on masu endings, while i-adjective questions remind learners not to add da in plain style.
My Page stores challenge history, best records, and often missed questions, making the quiz useful for repeated review.
Polite style is helpful when writing to readers in a friendly and respectful tone. Plain style is useful when explaining facts or opinions briefly and clearly.
The goal is not to say one style is always better, but to choose a style for the audience and purpose, then keep the writing consistent.