

The children swim in the river.
[ðə ˈtʃɪldrən ˈswɪm ˈɪn ðə ˈrɪvər.]
Is this river clean?
[ˈɪz ˈðɪs ˈrɪvər ˈklin?]
Let's walk along the river.
[ˈlɛts ˈwɔk əˈlɔŋ ðə ˈrɪvər.]
"river" is in the lesson "Countryside" (Level 16), along with 10 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.