"when it pertains" is correct and can be used in written English.
For example, you could write, "I trust the opinion of this expert when it pertains to this topic."
But I never use it when it pertains to sex, ever, because I don't think that is funny.
Scale is a tricky variable when it pertains to turning around a city, especially one as small as Braddock.
"If you don't stick your landing in talking about racial issues, particularly when it pertains to the criminal-justice system, then people just shut down.
Still, Mr. Fannin of The Star said, "All these leagues are getting more proprietary about their rights and what's theirs and what's theirs exclusively -- especially when it pertains to the Internet".
The judge, Alvin K. Hellerstein of Federal District Court in Manhattan, said he believed he had an obligation to let the C.I.A. director decide what should be released when it pertains to methods used to make uncooperative detainees divulge information.
It's less a movement than a standard: believers set the bar high not only for themselves but also for others who share their vision, especially when it pertains to black history, stories, and style.
The intergenerational income elasticity (IGE), ubiquitously estimated in the economic mobility literature, has been misinterpreted as pertaining to the expectation of children's income when it actually pertains to its geometric mean.
Although the intergenerational income elasticity (IGE) has long been the workhorse measure of economic mobility, this elasticity has been widely misinterpreted as pertaining to the conditional expectation of children's income when it actually pertains to its conditional geometric mean.
Sometimes I just like saying "VoIP" even when it doesn't pertain to anything I'm actually talking aobut.
MAKE YOURSELF A RESOURCE: Some of the best PR people provide journalists with information even when it doesn't pertain to their clients.
The intergenerational elasticity (IGE) has been assumed to refer to the expectation of children's income when in fact it pertains to the geometric mean of children's income.
