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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
which is hard
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "which is hard" is correct and usable in written English.
It can be used to describe something that is difficult or challenging in various contexts. Example: "Learning a new language, which is hard, requires dedication and practice."
✓ Grammatically correct
News & Media
Science
Formal & Business
Alternative expressions(20)
which is different
which is strange
that presents difficulties
which is wonderful
that's right
that much is certain
which is rare
that's not right
which is real
which is correct
which is applicable
which is accurate
which is depressing
that holds true
which is faithful
which is super
it's undeniable
which is weird
which is true
which is glorious
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
Which is hard.
News & Media
Which is hard to spot.
News & Media
Which is hard to argue with.
News & Media
We had this connection which is hard to describe.
News & Media
Proprietary research is predicting the future, which is hard.
News & Media
Which is hard, when you don't understand the problem.
News & Media
It requires an accurate inflation forecast, which is hard enough in normal times.
News & Media
This would favor a stable mosaic of wing patterns, each of which is hard to displace.
News & Media
Which is hard, because I'm sure you want to give your children everything".
News & Media
You're thinking about what landed you in this wretched place, which is hard to dramatize.
News & Media
Which is hard work, but sometimes even a tiny group can do it.
News & Media
Expert writing Tips
Best practice
When using "which is hard", ensure the "which" clause clearly refers to the preceding noun or situation to avoid ambiguity. For example, "Solving this problem, which is hard, requires a dedicated approach."
Common error
Avoid using "that" instead of "which" in non-restrictive clauses where "which is hard" provides additional, non-essential information. "That" is generally used for restrictive clauses that are essential to the meaning of the sentence.
Source & Trust
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "which is hard" functions as a non-restrictive relative clause, providing additional information about a preceding noun or situation. As Ludwig AI shows, it often adds a comment on the difficulty associated with the subject.
Frequent in
News & Media
54%
Science
33%
Formal & Business
7%
Less common in
Wiki
3%
Academia
0%
Reference
0%
Ludwig's WRAP-UP
In summary, "which is hard" is a very common and grammatically sound phrase used to express the difficulty of something. Ludwig AI confirms its frequent use in news and media, but also its presence in scientific and formal business writing, lending it a neutral register. When using the phrase, remember to ensure the "which" clause clearly refers to the preceding noun to avoid ambiguity. Alternatives such as "that is difficult" or "that is challenging" can be used for variety, although they may subtly shift the emphasis.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
that is difficult
Replaces "hard" with a more general synonym, focusing on the level of difficulty.
that is challenging
Emphasizes the demanding nature of the situation.
that proves difficult
Highlights the eventual difficulty encountered.
that presents difficulties
Focuses on the problems arising from the situation.
that requires effort
Shifts focus to the exertion needed.
it is not easy
Uses a more conversational and less direct way to express the difficulty.
it is no simple task
Emphasizes that the task is complex and requires careful handling.
that is quite demanding
Stresses the high expectations or requirements involved.
that is far from straightforward
Indicates the task involves complications and indirect routes.
that is fraught with difficulty
Highlights the abundance of challenges and obstacles.
FAQs
How can I use "which is hard" in a sentence?
Use "which is hard" to add a comment about the difficulty of something previously mentioned. For example: "Learning a new language, which is hard, takes time and dedication."
What can I say instead of "which is hard"?
You can use alternatives like "that is difficult", "that is challenging", or "it is not easy" depending on the context.
Is it correct to say "that is hard" instead of "which is hard"?
While both can be grammatically correct, "which is hard" is typically used in non-restrictive clauses to add extra information. "That is hard" is more common in restrictive clauses essential to the sentence's meaning. Rephrasing is also an option.
What's the difference between "which is hard" and "this is hard"?
"Which is hard" refers back to a specific thing or action mentioned earlier in the sentence, whereas "this is hard" is a statement about something immediately present or being experienced.
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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
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested