Yellow???

One day in a language school in Australia.
Teacher: “All right, now I’d like you to make a sentence using the words GREEN, PINK and YELLOW. Who’d like to try?”
A student raised his hand. It was Kukoya from Japan.
Kukoya: “Early this morning, I looked out the window, I saw the GREEN grass and PINK roses in the garden. I went outside and I feel the warm YELLOW sunlight around me.”
Teacher: “Not bad. Okay, who’s next?”
Another student raised his hand. It was Ah Beng from Singapore.
Ah Beng: “I try! I try. Can aaah?”
Teacher: “No, no, not you!”
Ah Beng: “Aaaiiyaaa… let me try lah… I can do lah… you think I’m stupid meeh…?”
Teacher: “Okay… go ahead…”
Ah Beng: “This morning I heard the phone GREEEEEN… GREEEEEN… I PINK up and I said: YELLOOOOW?”