

The referee is going to whistle for a penalty.
[ðə ˌrɛfəˈri ˈɪz ˈɡoʊɪŋ tu ˈwɪsəl fər ə ˈpɛnl̩ti.]
The referee whistled and the game was over.
[ðə ˌrɛfəˈri ˈwɪsəld ənd ðə ˈɡeɪm wəz ˈoʊvər.]
Why didn't he whistle for that foul?
[ˈwaɪ ˈdɪdn̩t ˈhi ˈwɪsəl fər ˈðæt ˈfaʊəl?]
"whistle" is in the lesson "Sport news" (Level 41), along with 11 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.