No.
can you retrain it yes you can!
i am going to retrain my dragon.
After losing their jobs they all had to retrain to get skills for different kinds of work.
It is not hyphenated.
Retrain
No it's not hyphenated.
Motorcycle is not hyphenated
you retrain, you can retrain from oz in central station, habuki in Selena's bar and several other places
words are only hyphenated when they have a separate meaning when separated than they do when hyphenated
Yes it should be hyphenated.
No, "hardworking" is not hyphenated.
It can be. Some words can be seen both hyphenated and non-hyphenated.