Answer:
yes yes yes yes yes yes yes
If you're trying to write a story that "ends with the words: How wrong he was" you may want to make the story about some kind of stance you make that he disagrees with. You could choose any topic that usually creates tension between people, such as politics or the environment.
its possible!! read alot of english book, watch alot of english movies with the subtiltle of your language or get a english turtering or just go to english websites!