"has failed" is correct and usable in written English. You can use it to indicate that someone or something has been unsuccessful or unsuccessful in achieving something. For example, "Despite his best efforts, John's attempt to pass his driving test has failed."
"Clearly, rehabilitation has failed".
"Persuasion has failed.
Socialism has failed.
The attempt has failed.
This president has failed.
McDowell has failed.
That approach has failed.
"Communism has failed.
The coup has failed.
But it has failed.
This government has failed.
Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia