nina:this tie is blue,isn't it? Bayu:...................adalah

Kalau positif jawabannya..
- Yes,it's
Lebih jelasnya : yes,this tie is blue

Kalau negatif jawabannya..
- No,it isn't ( No,it is not)
Lebih jelasnya : no,this tie isn't blue

Nina : This tie is blue , isn't it ?
Bayu : Yes , it is ---> [+]
Bayu : No , it isn't ----> [-]

Semoga bermanfaat ^_^