The sound th Is the sound that I have problems speaking English most. I want to make it clear and is the natural. In a development of pronunciation, I have to find out how th and easier to pronounce. This I practice is listening music, talking with siri on iPhone and comparison 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.