The phrase "it changes constantly" is correct and usable in written English.
You can use it when you want to emphasize that something is in a continuous state of change. Example: With the ever-evolving technology landscape, it changes constantly.
The roster of outlets surveyed is not adjusted only once every five years; it changes constantly.
But people's relationship to it changes constantly, just as the city and the countryside around it change.
The answer is because there's an etiquette to swearing which, though it changes constantly, remains ever present.
No one, after all, has just one face; it changes constantly according to such variables as angle of view, mood, lighting and the ageing process.
Silverdale lies about a third of the way around the curve of Morecambe Bay, and like many places in that area, it changes constantly at the whim of the tide.
At face value, the landscape is all red dirt and scrub but if you observe with a stockman's eye, it changes constantly from low saltbush, to larger trees to dry lakes.
Moore's Law changes constantly, but human beings do not.
Try and use people you know a lot about so you can add them in knowing how they'll fit in and their personality so it doesn't change constantly bit change them up a bit all the same.
The film veers like an out-of-control Peugeot from violence to comedy to edgy romance to grim tragedy, and it changes speeds constantly, jerking forward suddenly, then slowing to a crawl, and then gunning it again for no apparent reason.
Because flu viruses change constantly, it's uncertain whether any of these four antibodies would still work if a new H5N1 strain unleashes a pandemic; it may be necessary to start anew with antibodies from future patients.
In a business where technology and consumer preferences change constantly, it's remarkable that Washington, D.C.-based Harman International has managed to stay at the front of the curve.
