Ask vs Inquire vs Probe vs Question vs Request

When to use each in English, with meaning, register, and examples.

Ask

Top 1,000 (very common) A1 verb

Inquire

Formal Beyond 10,000 (less common) B1 verb

Probe

Top 2,000 (common) C1 noun

Question

Top 1,000 (very common) A1 noun

Request

Top 1,000 (very common) A2 noun

Most formal: Inquire

	Ask	Inquire	Probe	Question	Request
Pronunciation	🇬🇧 /["/ɑːsk/","/ɑːsks/","/ɑːskt/","/ˈɑːskɪŋ/"]/ 🇺🇸 /["/æsk/","/æsks/","/æskt/","/ˈæskɪŋ/"]/ Hear Ask	🇬🇧 /["/ɪnˈkwaɪə(r)/"]/ 🇺🇸 /["/ɪnˈkwaɪər/"]/ Hear Inquire	🇬🇧 //prəʊb// 🇺🇸 //proʊb// Hear Probe	🇬🇧 /["/ˈkwestʃən/"]/ 🇺🇸 /["/ˈkwestʃən/"]/ Hear Question	🇬🇧 /["/rɪˈkwest/"]/ 🇺🇸 /["/rɪˈkwest/"]/ Hear Request
Meaning	To say you want to know something or want something from someone.	to ask about something	A tool to investigate or explore something deeply.	A sentence or phrase that asks for information.	to ask for something
Example	I want to ask you a question about your homework.	I called the school to inquire about the application process.	The scientists sent a probe to study the surface of Mars.	The teacher asked a difficult question during the exam.	I would like to make a request for a day off next week.
Register	Neutral	Formal	Neutral	Neutral	Neutral
How common	Top 1,000 (very common)	Beyond 10,000 (less common)	Top 2,000 (common)	Top 1,000 (very common)	Top 1,000 (very common)
CEFR level	A1	B1	C1	A1	A2
Part of speech	verb	verb	noun	noun	noun
Collocations	gently, quietly, softly, want to, dare (to), forget to, about, get asked something, if you don’t mind me asking, if you don’t mind my asking, nicely, specifically, for, nicely, specifically, for, nicely, specifically, for	inquire about, inquire into, inquire if, inquire regarding, inquire as to	space probe, medical probe, investigative probe, deep probe	awkward, difficult, embarrassing, ask (somebody), have, address, question about, question as to, question concerning to, awkward, difficult, embarrassing, ask (somebody), have, address, question about, question as to, question concerning to, burning, challenging, controversial, bring up, pose, raise, arise, go unanswered, remain unanswered, question about, question for, question of, come into, call into, be open to, beyond question, in question, without question	special, legitimate, reasonable, make, put in, send, at somebody’s request, by request, on request, available on request, available upon request, by popular request, special, legitimate, reasonable, make, put in, send, at somebody’s request, by request, on request, available on request, available upon request, by popular request
Antonyms	refuse, deny, ignore	ignore, disregard, ignore	ignore, avoid	answer, solution	refuse, decline
Common mistakes	'Ask for' vs 'ask to': Confusing when to use 'for' versus 'to'., Overusing: Using 'ask' too frequently in a conversation can sound repetitive., Omitting the object: Forgetting to specify what you're asking for or about.	Using 'inquire' instead of 'require'., Confusing 'inquire' with 'enquire' (especially in British English)., Using 'inquire' without a specific subject (e.g., 'I want to inquire the details' instead of 'I want to inquire about the details').	Confused with 'probe' as a verb instead of a noun., Used too generically; may not be appropriate in informal contexts.	Confusing 'question' with 'query' in formal contexts., Using 'questions' as a singular noun, e.g., 'I have a question' instead of 'I have questions.'	Using 'request' with a different preposition, such as 'request for'., Confusing 'request' with 'require'., Not using it in the correct form, like 'requested' instead of 'requesting'.
Usage notes	Use 'ask' when requesting information or help. It's suitable for most situations but can be too direct in formal contexts. Be mindful of politeness.	Use 'inquire' in formal contexts, such as business or official situations. It's less common in everyday conversation, where 'ask' is preferred. Avoid using it in informal settings.	Used in scientific and technical contexts, as well as metaphorically in discussions about examining issues. Not commonly used in casual conversation.	Use 'question' in both formal and informal settings. It's appropriate in classrooms, interviews, and casual conversations. Avoid using in situations where a statement is expected.	Used in polite or formal contexts. It may sound too formal for casual conversations, where simpler words like 'ask' are preferred.

Frequently asked questions: Ask vs Inquire vs Probe vs Question vs Request

What's the difference between Ask, Inquire, Probe, Question, and Request?

Ask: To say you want to know something or want something from someone. Inquire: to ask about something Probe: A tool to investigate or explore something deeply. Question: A sentence or phrase that asks for information. Request: to ask for something

Which is more formal: Ask, Inquire, Probe, Question, and Request?

Inquire is the most formal of these.

Are Ask, Inquire, Probe, Question, and Request the same CEFR level?

Ask: A1, Inquire: B1, Probe: C1, Question: A1, Request: A2 on the CEFR scale.

Can I use Ask, Inquire, Probe, Question, and Request interchangeably?

Not always. Ask, Inquire, Probe, Question, and Request are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.