But what vs What about

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

But what

Top 3,000 (common)

What about

Top 2,000 (common)
Most common: What about
 But whatWhat about
Pronunciation🇬🇧 //bʌt wɒt//🇺🇸 //bʌt wɑt//🇬🇧 //wɒt əˈbaʊt//🇺🇸 //wɑt əˈbaʊt//
MeaningA phrase used to introduce a contrast or question.A way to ask for someone's opinion on a subject.
ExampleI understand your point, but what if we consider the other side?What about going to the beach this Saturday?
RegisterNeutralNeutral
How commonTop 3,000 (common)Top 2,000 (common)
Collocationsbut what about, but what ifWhat about that, What about this, What about me
Common mistakesUsing in overly formal contexts, where other phrases are more suitable., Incorrectly placing 'but' at the start of a sentence when it should connect to a clause.Confused with 'What about that?' - often used differently in context., Not using it to introduce new topics when needed., Overusing in formal discussions where direct questions are preferred.
Usage notes"But what" is typically used informally to question or contradict something previously said. It's less formal than other phrases.Used in conversation to introduce a new topic or ask for opinions. Appropriate in most informal and neutral contexts.

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But what
What about

Frequently asked questions: But what vs What about

What's the difference between But what and What about?

But what: A phrase used to introduce a contrast or question. What about: A way to ask for someone's opinion on a subject.

Which is more common: But what and What about?

What about is the most common in everyday English.

Can you show an example of each?

But what: I understand your point, but what if we consider the other side? What about: What about going to the beach this Saturday?

Can I use But what and What about interchangeably?

Not always. But what and What about 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.

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