

No one is at home.
[ˈnoʊ ˈwən ˈɪz ət ˈhoʊm.]
No one answered the phone.
[ˈnoʊ ˈwən ˈænsərd ðə ˈfoʊn.]
There's no one in the office.
[ˈðɛrz ˈnoʊ ˈwən ˈɪn ði ˈɑfəs.]
"no one" is in the lesson "Pronouns" (Level 30), along with 17 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.