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The phrase "are the primary components" is correct and usable in written English.
It can be used when discussing the main elements or parts of a particular subject or system.
Example: "In this study, we will analyze what are the primary components of effective communication."
Alternatives: "constitute the main elements" or "serve as the key parts".
Exact(16)
Sugar refining and liquor distilling, as well as tourism, are the primary components of its economy.
Quartz is a widely used piezoelectric material and quartz resonators are the primary components in many industrial applications due to the piezoelectric effect.
G proteins, further divided into four subfamilies (Gs, Gq, G12 and Gi) based on their Gα subunits, are the primary components activated by G protein-coupled receptors (GPCRs).
Linalool and geraniol are the primary components of rose oil, palmarosa oil, and citronella oil and many other essential oils, and two important compounds used in the flavour and fragrance, cosmetic or pharmaceutical industries.
Particular attention was paid to those processes where there was limited information available on inventory data, for example mining and processing of rare earth metals, and electrolytic cell assembly, which are the primary components of a hydrogen generation plant.
Insect corpses, taxidermy, tree root and superglue are the primary components of London-based artist Tessa Farmer's intricate sculptural installations.
Similar(44)
Succulent parts of herbs and grasses, leaves, and new shrub growth are eaten in the spring, and seeds are the primary component of the summer diet, with stems and roots being the mainstay in fall and early winter.
On the other hand, the "images" that are the primary component of Russell's view surely have propositional content.
Recent evidence suggests that polysaccharides are the primary component of seaweed having anticancer activity (Holdt and Kraan 2011).
Saltating sand grains are the primary component of airborne sand and account for 75% of all sand transport flux.
Fish are the primary component of the river otter's diet throughout the year.
More suggestions(13)
are the major components
are the key components
are the primary ingredients
are the fundamental components
are the primary elements
are the predominant components
are the primary constituents
are the primary hardware
are the leading components
characterize the primary components
are the main components
are the primary determinants
are the essential components
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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