used to be

Researchers only detected the gas recently, because it used to be notoriously hard to measure and earlier work focussed on warmer oceans, whereas the polar oceans are the emission hotspots.

First Class has been reduced to what economy used to be.

Blazing passion used to be Jolie’s whole thing.

But getting a Christmas number one is more complicated than it used to be, when the winner was simply the one which had sold the most singles.

That's why we see what's huge now, whether it's Chappell or Sabrina or Charli or Billie or Olivia, so many of these artists who are women writing their own songs about their own lives on this very real and candid level and not having any male producer writing the songs for them, which used to be the standard practice for decades and decades.