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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
if they cannot
Grammar usage guide and real-world examplesUSAGE SUMMARY
The part of the sentence "if they cannot" is correct and usable in written English.
You can use it whenever you are discussing a hypothetical situation, such as in the sentence "If they cannot finish the task on time, they may have to work late."
✓ Grammatically correct
News & Media
Science
Wiki
Alternative expressions(1)
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
59 human-written examples
If they cannot they deserve to fail".
News & Media
If they cannot, perhaps they are discriminating.
News & Media
And what will happen if they cannot?
News & Media
It's as if they cannot help themselves.
News & Media
If they cannot extricate themselves, many will have to stay.
News & Media
And how do they replace him if they cannot?
News & Media
If they cannot, a mistrial will be declared.
News & Media
And if they cannot, where will they go?
News & Media
If they cannot, Argentina may require a new government.
News & Media
Manufacturers lose money if they cannot sell all they make.
News & Media
If they cannot agree, Hearst would receive no money.
News & Media
Expert writing Tips
Best practice
Use "if they cannot" to introduce a clear condition and its potential consequence. Make sure the sentence clearly outlines what happens if the condition is met.
Common error
Ensure the "they" is clearly defined and understood by the reader. Avoid ambiguity by rephrasing or explicitly stating who "they" refers to, especially if the context has shifted.
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "if they cannot" functions as a conditional clause, introducing a hypothetical situation where a group or entity is unable to perform an action. It sets up a condition that dictates a specific consequence, as demonstrated in Ludwig's examples.
Frequent in
News & Media
57%
Science
27%
Wiki
11%
Less common in
Formal & Business
3%
Encyclopedias
1%
Academia
1%
Ludwig's WRAP-UP
In summary, "if they cannot" is a grammatically sound and frequently used conditional clause that sets up a scenario based on someone's inability to do something. As confirmed by Ludwig, it's suitable for various contexts, ranging from formal to informal, though slightly more formal than "if they can't". You can find it often in "News & Media", scientific writing, and general discussions. To ensure clarity, always specify who "they" refers to. When using this phrase, make sure the consequent action or situation is clearly defined. Consider using alternatives like "if they're unable to" or "should they fail to" to vary your writing. Ludwig provides numerous real-world examples illustrating its wide applicability.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
if they're unable to
Replaces "cannot" with "are unable to" maintaining similar meaning but different phrasing.
supposing they are unable to
Similar to "assuming", but with a slightly more hypothetical tone.
in the event they can't
Emphasizes the possibility of inability as a condition.
assuming they are not able to
Introduces the condition as an assumption of inability.
should they fail to
Uses a more formal and emphatic construction to indicate failure.
in cases where they're incapable of
Highlights the incapability as a reason.
if they do not succeed in
Shifts the focus to a lack of success rather than a lack of ability.
if it's impossible for them to
Highlights the impossibility aspect of the condition.
if they lack the capacity to
Focuses on the lack of capacity as the reason for inability.
on the off chance they can't
Presents inability as a less probable condition.
FAQs
How can I use "if they cannot" in a sentence?
The phrase "if they cannot" introduces a conditional clause expressing what will happen when someone is unable to do something. For example: "If they cannot finish the task on time, they will need to work overtime".
What are some alternatives to "if they cannot"?
Alternatives include phrases like "if they're unable to", "should they fail to", or "in the event they can't", depending on the desired level of formality and emphasis.
Is it better to use "if they cannot" or "if they can't"?
Both "if they cannot" and "if they can't" are grammatically correct. "If they cannot" is slightly more formal, while "if they can't" is more conversational. The choice depends on the context and audience.
What is the difference between "if they cannot" and "unless they can"?
"If they cannot" introduces a condition where inability leads to a specific outcome. "Unless they can" implies that the condition will only be avoided if they are able to perform the action. They highlight different perspectives on the condition.
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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
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested