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The phrase "alterations were needed" is correct and usable in written English.
It can be used when indicating that changes or modifications are required in a particular context, such as a project, document, or design.
Example: "After reviewing the draft, it became clear that several alterations were needed to improve clarity and coherence."
Alternatives: "modifications were necessary" or "changes were required."
Exact(2)
The way the benchmarks are calculated was changed this year, leading to many being lowered, but universities including Oxford and Cambridge said further alterations were needed.
The coelacanth genome is therefore more likely to shed light on the central evolutionary question of what genetic alterations were needed to change a lobe-finned fish into the first land-dwelling tetrapod.
Similar(58)
Thus no alterations are needed in the global system assembly described in reference [1].
This process helps me see it afresh and decide what further alterations are needed, as even when a poem has been published it may not be in its final form.
Nonetheless, large alterations are needed to achieve low BER values.
DNA alterations are necessary for the evolution by natural selection 7. DNA alterations are necessary for speciation 8. DNA alterations are needed to cause species diversity.
There are DNA changes that do not affect the phenotype 4. DNA alterations are needed to cause genetic diversity 5. DNA alterations can cause phenotypic variations 6.
I use the same php file with every site…Just minor alterations are needed since its mearly [sic] a few lines of php code".
Noting the bottleneck, authorities stressed that both governments were "flexible" about the car-pooling concept and would continually evaluate its progress to determine if some alterations are needed.
Overall, metastases have been rarely reported, perhaps suggesting that additional genetic alterations are needed.
Further research on other characteristics and alterations is needed to find accurate diagnostic, prognostic, and predictive markers.
More suggestions(18)
alteration is needed
if alteration is needed
revisions were needed
corrections were needed
amendments were needed
renovations were needed
alterations were required
alterations were identified
alterations were greater
alterations are necessary
alterations were necessary
adjustments were needed
modifications were required
adjustment were needed
changes were needed
alterations were needed
modifications were needed
alterations were insufficient
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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