--Pronunciation barrier-- There is a big deference between Japanese and English pronunciation. Many Japanese pronounce "F,R,V" as "H, L,B". It means if they say "right" , you will probably figure it as "light" (This is exactly what I experienced) It is because we don't have these sounds "F,R,V" in Japanese, so mostly people pronounce difficult without practice and one more thing, we should understand about how to pronounce consonants. When I went to study abroad, I experienced that I couldn’t tell correctly what I want to say. I realized how important it is. I was disappointed in myself. After that, I tried to learn pronunciation. I studied Phonics. I read aloud the words to Siri many times. Some people think that pronunciation is not so important. I know that if you can pronounceable enough to understand others, that’s fine. As for me, I think that this is the top priority before remembering new words. In my experience, if you are a non-native speaker, you probably have a strong accent of your native language when you speak English. It's hard to hear that even if you speak perfect grammar English. On the other hand, people who focused on pronunciation, it’s easy to hear that even if there are few grammatical mistakes. I think that this is important to conversation comfortable. Furthermore simply thinking, you seem speaking English fluently if your pronunciation is great.