- 毫无疑问 háowúyíwèn without a doubtbeyond all doubt; certainly; there is no question
- 疑问句 yíwènjù interrogative sentenceA sentence used to ask a question or express doubt; also known as [[问句|問句|wen4 ju4]].
- 质疑问难 zhìyíwènnàn to raise questionsto raise doubts and difficult problems for discussion, debate, or clarification
- 疑问代词 yíwèndàicí interrogative pronounA pronoun used to ask a question, such as [[谁|誰|shei2]], [[什么|什麼|shen2 me5]], or [[哪儿|哪兒|na3 r5]]
- 疑问代名词 yíwèndàimíngcí interrogative pronounA word used to ask a question that replaces a noun, such as [[谁|誰|shei2]], [[什么|什麼|shen2 me5]], or [[哪|哪|na3]]
- 疑问号 yíwènhào question marka punctuation mark used at the end of a sentence to indicate a question