

My dog is afraid of thunder.
[ˈmaɪ ˈdɔɡ ˈɪz əˈfreɪd əv ˈθəndər.]
We heard loud thunder in the middle of the night.
[wi ˈhɜrd ˈlaʊd ˈθəndər ˈɪn ðə ˈmɪdl̩ əv ðə ˈnaɪt.]
Was that thunder or just a big truck?
[wəz ˈðæt ˈθəndər ɔr ˈdʒəst ə ˈbɪɡ ˈtrək?]
"thunder" is in the lesson "Disasters" (Level 14), along with 14 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.