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The phrase "are sometimes absent" is correct and usable in written English.
It can be used to describe situations where something or someone is not present on certain occasions.
Example: "In large gatherings, some members of the committee are sometimes absent due to scheduling conflicts."
Alternatives: "may occasionally be missing" or "are occasionally not present".
Exact(8)
In Japan, BHD is not yet well known because skin-related symptoms of fibrofolliculomas are sometimes absent unlike in most cases in Europe and the United States.
The Upfronts shtick showed that Kimmel still had the fangs that made his early pranks so viciously funny, but that are sometimes absent from the softball-heavy interviews on "Jimmy Kimmel Live".
Submission of other variables is optional and these data are sometimes absent.
Thus, certain values such as acute phase reactants are sometimes absent.
Therefore, gastrointestinal symptoms are sometimes absent in the setting of the disease and RAS could be the first or the sole presentation of GSE.
According to previous reports, cassettes located within the variable region of integrons are sometimes absent in the structure of integrons [ 18].
Similar(52)
At this level, talent is a given; it is attitude that is sometimes absent.
The Politics of the Hypothetical And yet the politics of smart guns have a sureness about them that is sometimes absent from the issue's science.
Sympathy for the Spaniard is sometimes absent in America, following controversial remarks two years ago that he would invite Tiger Woods to dinner and serve him "fried chicken".
Class schedules at the Texas school were frequently rearranged and teachers were sometimes absent.
The upper part of the Sarvak Formation is sometimes absent due to erosion during the Turonian unconformity.
More suggestions(16)
are sometimes unavailable
are sometimes nonexistent
are often absent
are always absent
are occasionally absent
are sometimes failing
are sometimes lost
are sometimes not available
are sometimes neglected
are sometimes missed
are sometimes omitted
are sometimes lacking
are seldom absent
were often absent
was often absent
are sometimes excluding
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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