In Engpsh, you can say that something "changes constantly" or "is always changing." You could also say that it is "in a state of flux," which means that it is constantly changing or unstable. Here are a few examples:

The weather in this region is always changing.
The stock market is in a state of flux, with prices going up and down all the time.
The poptical landscape is constantly changing, with new parties and leaders emerging all the time.