

구 번 버스를 기다리고 있어요.
[ku pʌn pʌsɯlɯl kitaliko is͈ʌjo.]
I'm waiting for bus number nine.
구 층은 사무실이에요.
[ku t͡ɕʰɯŋɯn samusiliejo.]
The ninth floor is offices.
구 개월 동안 한국어를 공부했어요.
[ku kɛwʌl toŋan hankukʌlɯl koŋpuɛs͈ʌjo.]
I studied Korean for nine months.
"구" is in the lesson "Numbers" (Level 3), along with 19 other useful words. LinDuo has 180 topic lessons like this one, 2,380 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.