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grrr, English is so hard to learn - especially pronunciation - that sometimes I want to give up to study!!

Generaly and often it is said that to distingish L and R sounds in English is difficult for the Japanese, and I think it is true because I've suffering from IT for many years!!!

But not only are L/R problems, but also V/B, F/H, etc are tough stuffs..

Now I can tell the different between "See/She" or "Fun/Fan",
but when native english speakers speak those words really fast,
I'm not sure whether to be able to recognize them...

So, here are my questions:

How can I improve my listening/pronunciation skills??

Many people say that watching TV/Radio is good,
or some people say "seach the internet, and check the web-sites which teach about pronunciation."

Yea, I think it'd be the best way to improve my English skill..
but even I watch movies and check the web-site(i don't know the web-site i checked was good one or not, though),
still I can't correct it!!

So could you give me some advice how to fix the pronunciation
if you have?

 And I'd be very glad if you correct my english sentences as well : )