How the word "twenty" is translated into English
My sister is twenty years old.
[ˈmaɪ ˈsɪstər ˈɪz ˈtwɛnti ˈjɪrz ˈoʊld.]
This T-shirt costs twenty dollars.
[ˈðɪs ˈtiˌʃɜrt ˈkɔsts ˈtwɛnti ˈdɑlərz.]
Can you wait twenty minutes, please?
[kən jə ˈweɪt ˈtwɛnti ˈmɪnəts, ˈpliz?]
"twenty" is in the lesson "Big numbers" (Level 4), 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.