The phrase "alternately become" is correct and usable in written English.
It can be used to describe a situation where something changes back and forth between two states or conditions.
Example: "The weather can alternately become sunny and rainy throughout the day, making it difficult to plan outdoor activities."
Alternatives: "alternatively turn" or "switch back and forth".
Their assignment to control or intervention occurred only by their chance enrollment in the obligatory education groups which alternately became the control and intervention groups in this study.
Alternately, they become scary and saintly; grotesque mutants and smooth doo-wop singers; chipper domestic souls who banter to the accompaniment of a sitcom laugh-track and hounds of hell.
Alternately, the spectra become more complex, when ZrOCl2 concentration decreases (compare data for CR-3 and CR-6).
Or, alternately, it can become just another unit to digest, another chapter to read, and another test to take before the weekend sets you free.
Remark 2.2 We note that from the definition above, beside p, the basins B ( A 1 ) and B ( A 2 ) approach to p alternately, meanwhile they become narrower and narrower.
In sum, our data indicate that throughout the conformational cycle of AcrB the proton-binding sites within the TM domain become alternately accessible to the periplasm or the cytoplasm.
Alternately, it can become part of a complex doll or animal.
Another, who made his name as a conservative libertarian, supports regulation that also happens to be useful to A.T. & T. Alternately, a scholar may become entrenched in his or her views to the point of absurdity.
Their bluffs and showdowns, alternately scary and comical, become a furious duet in which the house, functioning as therapist, fosters a melting of resistance so that the circulation, to paraphrase Freud, can make its way into previously cut-off regions.
Time becomes alternately dense and weightless; everything moves faster yet with more consequence.
