Dear professors who know 3 foreign languages and more, please, take part in a little research)

منذ ٥ أعوام

If you have a little time, please, take part in a little research which I´m doing for my Master´s thesis. Could you tell about your personal experience in learning languages. For example, 
- How many foreign languages do you know and what languages are they?
- What was the hardest thing for you in learning them?
- Why did you decide to learn so many foreign languages?
- Do you have favorite foreign language among all the languages you know?
- Do you have any personal secret that helps you to learn?

I would be very grateful! Thank you in advance!:)