Watch this short video to see some more examples of silent letter words. Vowel sounds are made by the letters 'a', 'e', 'i', 'o' and 'u'. Unstressed vowels are vowel sounds that are hard to hear ...

It's also a personal challenge, but that's a secondary motivation.' Hanns Bergmann is the first mate of Silent Sound, meaning he is second in command to the skipper. Sailing is his passion and career.