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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
what to do
Grammar usage guide and real-world examplesUSAGE SUMMARY
'what to do' is correct and usable in written English.
It should be used in contexts where you are asking someone for advice or guidance. For example: "I'm completely overwhelmed. I don't know what to do."
✓ Grammatically correct
News & Media
Wiki
Science
Formal & Business
Alternative expressions(20)
how to proceed
how to do it
what should be done
the next course of action
where to go from here
how to respond
what options are available
what to say
what to tell
what steps to take
what is the best course of action
how to play
how to choose
how to explain
how to tell
how to help
how to get
how to win
how to mix
how to travel
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
60 human-written examples
What to do, what to do?
News & Media
So what to do?
News & Media
Here's what to do.
News & Media
What to do? Triage?
News & Media
But what to do?
News & Media
He knew what to do.
News & Media
We discussed what to do.
News & Media
What to do about that?
News & Media
"You know what to do.
News & Media
What to do with it?
News & Media
Tell me what to do!
News & Media
Expert writing Tips
Best practice
In creative writing, use it as a short, internal monologue question to emphasize a character's stress or confusion.
Common error
Avoid using a question mark when the phrase is embedded as a noun clause within a statement. For example, 'I need to know what to do.' is correct, whereas 'I need to know what to do?' is a punctuation error.
Source & Trust
86%
Authority and reliability
4.9/5
Expert rating
Real-world application tested
Linguistic Context
This phrase functions primarily as a wh-infinitive clause, serving as a noun equivalent in a sentence. Ludwig indicates it acts as the direct object of verbs related to cognition or communication, such as "know", "decide", "tell" and "wonder".
Frequent in
News & Media
55%
Wiki
20%
Science
15%
Less common in
Reference
5%
Encyclopedias
3%
Social Media
2%
Ludwig's WRAP-UP
The phrase "what to do" is a fundamental component of English syntax, primarily serving as a wh-infinitive clause. Ludwig AI confirms its grammatical correctness and high frequency across diverse domains, including News & Media and Science. Its versatility allows it to function as an indirect question, a rhetorical device or a direct command. Whether used to express profound indecision in literature or to guide users through technical steps in a manual, it remains one of the most efficient ways to frame an inquiry into action.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
what should be done
Switches to a passive structure to emphasize the necessity of the action.
which steps to take
Focuses on a sequential process rather than a general action.
how to proceed
A more formal version often used in professional or technical contexts.
what action to take
Emphasizes the specific choice of deed or response.
how to handle this
Focuses on management or resolution of a specific problem.
the next course of action
A formal noun phrase used to describe planned future behavior.
where to go from here
A figurative way to ask about future direction or strategy.
how to respond
Narrows the scope to reacting to a specific event or person.
which way to turn
Often used to express a more desperate or metaphorical sense of lost direction.
what options are available
Focuses on the variety of possible choices rather than the final decision.
FAQs
How to use "what to do" in a sentence?
You can use it as a subject or an object to indicate action. For example: "When the power goes out, I never know "what to do"."
What can I say instead of "what to do"?
You can use alternatives like "<a href="/s/how+to+proceed" target="_blank" rel="alternative">how to proceed", "<a href="/s/what+action+to+take" target="_blank" rel="alternative">what action to take" or "<a href="/s/the+next+steps" target="_blank" rel="alternative">the next steps" depending on the context.
Which is correct, "what to do" or "what to be done"?
Both are correct. "what to do" is active and common, while "<a href="/s/what+is+to+be+done" target="_blank" rel="alternative">what is to be done" is passive and much more formal.
What is the difference between "what to do" and "how to do"?
The phrase "what to do" asks about the action itself, while "<a href="/s/how+to+do+it" target="_blank" rel="alternative">how to do it" focuses on the method or specific mechanics of the task.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
86%
Authority and reliability
4.9/5
Expert rating
Real-world application tested