Yes. Plagiarism is stealing. Changing around someone else's work does not make it your own original work. If you take someone's house, paint it a different color, and rearrange the furniture, it is still his house.
You can use someone else's idea to inspire you to write your own original work. Writers do that all the time. There are thousands of stories based on the idea of star-crossed lovers.
You can use quotes from someone else's work if you have permission from the original author and if you acknowledge the source of the quote.
A writer's words are copyrighted. Ideas are not.
IP is still the original copyright the case from George Harrison (my sweet lord music sound) was very similar to your question the riff of the music was similar therefor he lost his case because it wasnt his original idea but a version of from a popular song riff of another artist.
how much is it to change car titile name
he made a change in someone elses life
yes if it is from someone elses work
Walking a mile in someone elses shoes.
Is it illeagal to change someone elses password?
I want to report immigrants using someone elses documents.
No,it is rude and illegal to rip someone elses' campaign poster.
take someone elses ;)
Goldilocks
yes
you touch you lips to someone elses :)
sure