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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
that are necessary
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "that are necessary" is correct and usable in written English.
It can be used to specify essential elements or requirements in a statement. Example: "We must include all the documents that are necessary for the application process."
✓ Grammatically correct
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified similar examples from authoritative sources
Similar Expressions
60 human-written examples
strips of your fabric that are 4in.
Wiki
highway — that's 4 m.p.g.
News & Media
And that was 44 years ago".
News & Media
"Of course, that was 40 years ago".
News & Media
"In our study, that's 3.5 hours".
News & Media
For index funds, that's 0.13%.
News & Media
Less tax, that was £400 I got.
News & Media
Notated, that's e4xf5.
Wiki
For this instance, that's 21.6.
Wiki
For you Celsius fans, that's 176°.
Wiki
"That was 10 minutes".
News & Media
Expert writing Tips
Best practice
When using "that are necessary", ensure the context clearly defines what happens if the necessary elements are missing. This clarifies the importance of those elements.
Common error
Avoid using "that are necessary" repeatedly within long, convoluted sentences. Break down the sentences or use synonyms to improve clarity.
Source & Trust
60%
Authority and reliability
3.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "that are necessary" functions as a relative clause, modifying a noun or pronoun by specifying which items or actions are essential in a given context. Although Ludwig does not provide direct examples, it confirms the phrase's grammatical correctness.
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Ludwig's WRAP-UP
In summary, the phrase "that are necessary" functions as a relative clause used to specify essential items or actions. Although Ludwig indicates its grammatical correctness, the absence of examples suggests a need for careful contextual usage. It is generally neutral in register and can be used in various formal and informal settings depending on context, though examples are needed to better assess context and nuance.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
which are essential
Replaces "necessary" with "essential", emphasizing the indispensable nature of the items or actions.
which are required
Substitutes "necessary" with "required", highlighting the mandatory aspect of the items or actions.
that are indispensable
Uses "indispensable" instead of "necessary", stressing that the items or actions are crucial and cannot be done without.
that are crucial
Replaces "necessary" with "crucial", underscoring the importance and critical nature of the items or actions.
that are vital
Substitutes "necessary" with "vital", emphasizing that the items or actions are essential for survival or success.
that are obligatory
Uses "obligatory" instead of "necessary", denoting that the items or actions are compulsory or mandatory.
that are compulsory
Replaces "necessary" with "compulsory", indicating that the items or actions are required by law or rule.
that are imperative
Substitutes "necessary" with "imperative", highlighting that the items or actions are urgently required.
what is needed
Rephrases the clause to focus on the need, rather than the necessity.
those which are paramount
Uses "paramount" to suggest that the items or actions are of utmost importance.
FAQs
How can I use "that are necessary" in a sentence?
You can use "that are necessary" to specify which items, actions, or conditions are essential for a particular purpose. For example, "Ensure you have all the documents "that are necessary" for the application".
What are some alternatives to "that are necessary"?
Alternatives include "that are essential", "that are required", or "that are crucial", depending on the specific nuance you want to convey.
Is there a difference between "that are necessary" and "that are essential"?
While similar, "necessary" generally means needed to achieve a specific outcome, while "essential" implies something is fundamental and indispensable. The best choice depends on the specific context.
Can I use "which are necessary" instead of "that are necessary"?
"That" is used in restrictive clauses that are essential to the meaning of the sentence, while "which" is used in non-restrictive clauses that provide additional but non-essential information. If the clause is essential to the sentence's meaning, use "that are necessary"; otherwise, use "which are necessary".
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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
60%
Authority and reliability
3.5/5
Expert rating
Real-world application tested