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If you are saying "I am happy," you would use ureshii, or if you are saying happiness, you would say "shiawase"
Joyeuse saint Valentin or "Bonne saint Valentin
Simply say "Happy Mother's Day."
Yukai Fi-to
happy birthday
You may say 'ureshii.'
Happy independence day?
happy name day
Happy Friendship Day.
happy fathers day
happy mothers day