Questions & Answers about sushi wa yasui desu ka?
What does the particle は mark in 寿司は安いですか?
は is the topic marker. It indicates that 寿司 (“sushi”) is what we’re talking about—“as for sushi...” rather than marking it as the grammatical subject.
What kind of word is 安い, and why doesn’t it need な before です?
安い is an i-adjective (形容詞). I-adjectives can directly attach to です when used as a predicate, so you don’t insert な.
What is です doing in this sentence?
です is the polite copula, roughly equivalent to “is.” It softens or makes the statement polite, turning “cheap” into “is cheap.”
What role does the particle か play at the end?
か is the question particle. It converts a statement into a question—think of it as an explicit “?” at the end.
Why is the order 寿司は安いですか (topic–predicate) rather than English subject–verb–object?
Japanese follows a subject–object–verb (SOV) pattern, so the predicate (here 安いですか) comes at the end.
