I guess if you are a foreigner and your Japanese is on the same level as a Japanese graduated person. You can also do jobs in your field, whatever it is. Maybe there is a exaption for medical stuff or working for the covernment (police, army and that stuff). But offcourse you could work in every Japanese business there is. If you have the right diploma and mastered the language on the level that is expected for the job. So if you have a diploma in a particular field, and you want to work in that field but then in Japan. You should really focus on your language skill. Maybe even live in Japan for a year or something and do simple jobs just to master the language. Offcrouse you need to get a work permit and all that stuff. But that kind of information can be found within the Japanese embassy in your country. Keep in mind that Japan is a bureaucracy, so you need to fix a lot of stuff before you go! If you want to know if there are a lot of vacancies in a particuler field there is only one way to find out. Google for it on Japanese websites!! Offcrouse they are in Japanese so you are back at the language again xD

you mean Japanese people? Or a foreigner that speaks Japanese?

The best answer here is simple, Just spend a LOT of time learning. xD Also i want to add that its good to pratice in a lot of different ways. True rewriteing kanji's true reading kanji's but also to do some simple kanji memory games for a change. (never write down 1 kanji more then 3 of 4 times in a row. because after that you will go on autopilot and you won't learn anything from it.)

I just want to point out this video for you. Just because its fun to watch and also incredible! Its about a man who learned the icelantic language really fast! http://www.youtube.com/watch?v=qMz3gjl9x-M

Never! Its rude to say that! (just kidding) Inferior is just the word that means that somebody or thing is subordinate. You say "inferior to" when you are comparing two things. example: The human race is inferior (you don't say to what you are comparing) The human race in inferior to apes (you compare)

disappointment means that something happens (most of the time a person did something) that you not expected to happen in a negative way. Where consternation means that there is something wrong. There is terror/alarm/shock. There can be consternation, but you are not disappointed. Because you expected it to happen.

Its because you speak arabic. And thats so different! There is only one way to improve it. First you need to know how to say it in your head. Listen a LOT to english. True radio/television and movies. Maybe even music or videogames. And if you have done that. You know how it should sound. Then just speak a lot of English. Speak true skipe. Or in the mirror. What ever you like most. You can't learn it by speaking it if you don't know exactly how it should sound. I think that are the 2 steps. But remember. You will probably always keep your accent.