The phrase "a certain dialect" is correct and usable in written English.
It can be used when referring to a specific but unspecified dialect within a language.
Example: "In this region, a certain dialect is spoken that differs significantly from the standard language."
Alternatives: "a particular dialect" or "one specific dialect".
Philippus de Diversis, who described Ragusa as he saw it was in 1440, writes that the various officers of the republic do not make use either of Slav or Italian, in which they converse with strangers, but a certain other dialect only partially intelligible to us Romance-language speakers; he cites words with strong Romanian affinities.
The Chinese situation was a peculiar one because of the enormous number of people who speak Chinese, the very significant dialectal differentiation (certain dialects, particularly those in the south of China, would be considered by Western standards as separate languages), and the nature of the Chinese script.
The survival of Nahuatl as a whole is not imminently endangered, but the survival of certain dialects is, and some dialects have already become extinct within the last few decades of the 20th century.
Still others took on the "h" only in certain dialects: herb, for instance, stayed unaspirated in American pronunciation while it gained the "h" sound in British English.
These commentaries imply that by the 3rd century there were certain dialects called Apabhramsha and that these gradually rose to the literary level.
Many of us make assumptions based on the way people speak — judging certain dialects or accents as too posh, harsh, aggressive, unfriendly, "unintelligent" or "common".
This talk investigates variation in the ergative system of the Inuit dialect continuum, for which the ergative pattern has been observed to be weaker in certain dialects than in others.
Less widely spoken languages include Beary bashe and certain dialects such as Sankethi.
This conversation about Ebonics got me to thinking about Faulkner and James Baldwin, and the way certain dialects in this country get no respect.
