The frist sound is th. Is the sound that I have problems speaking English most. I want to speak make it clear and is the natural. In a development of pronunciation, I have to find out how th and easier to pronounce.
The second sound is v. Is the sound that I because The sound V similar sound F make it speak to not clear. That I have made a comparison between the sound of V and F.To show the difference of the sound and have confidence to read more.
This I practice is listening music, talking with siri on iPhone and comparison sounds with vocabulary. Normally, I'm a person who likes to listen to music every day and I likes to pretend SIRI on iPhone to make myself enjoy talking in English and pronounce clearly and naturally.