Most computers, tablets, and smartphones have some kind of "voice dictation" feature. Set it for English and see if you can read English into it and have it transcribe it correctly. The device will "hear" you the way a native speaker hears you. Your pronunciation may not be perfect, but if the device "understands" what you said, then a native speaker can understand you, too.

This list of sentences contains most of the sounds of English. Try reading it into a device set for "voice dictation." It may help you focus on the sounds where you have the most serious problems--sounds that native speakers may not understand unless you improve your pronunciation of them.

Don't set a goal out of twenty out of twenty. That's not realistic, I usually don't get all twenty myself. Be pleased by the ones it does transcribed correctly. There are some that may be almost impossibly hard. I don't know which ones are hardest for Japanese speakers.

1. It doesn't matter.

2. Which way will you pay?

3. I don't care, it's not fair.

4. My father is pretty old.

5. It's raining, I'll get wet.

6. I need to pay a fee.

7. Give me a minute.

8. I like to fly high.

9. Come here, I can't hear you.

10. The weather today is hot, but it's not too hot.

11. That's an old show.

12. I saw my daughter in the mall.

13. My boy wants to be a lawyer.

14. I live in South Norwood.

15. I took a book from the library.

16. Who knew the truth?

17. Butter the bread.

18. She's the most beautiful girl in the world.

19. Her hair is curly.

20. He climbed seven famous mountains.

Listening is the best way to improve and correct your pronunciation. Listening improves your speaking skill and reading improves your writing skill.

You can record yourself and I would love to try my best to help you!

@mayusan

I had some experiences working with Japanese people and I found that in general, Japanese speakers usually make substitutions for these sounds. So you'd better be careful with them, for example,

One more thing, don't use filler words like "umm", "eeto", "ano" when you think. Use some other words that native English speakers use like "well", "let me think", "this is interesting", "you know", "I mean". However, don't overdo it.

I hope that helps.

1) Practice with a native English speaker (of course)

2) Watch movies and tv shows in English and repeat with your voice what they say, even if you don't understand the words.

3) Americans speak with longer vowels than many other languages. I have noticed this helps people sound more natural. To stretch out the vowels a little bit.

4) Accept that being embarrassed (a small amount) is the price of sounding better.