How the word "once" is translated into English
I once lived in London.
[ˈaɪ ˈwəns ˈlɪvd ˈɪn ˈləndən.]
We once missed the last train home.
[ˈwi ˈwəns ˈmɪst ðə ˈlæst ˈtreɪn ˈhoʊm.]
My dad once met a famous actor.
[ˈmaɪ ˈdæd ˈwəns ˈmɛt ə ˈfeɪməs ˈæktər.]
"once" is in the lesson "Time 3" (Level 40), along with 13 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.