—What's one and two?一加二等于几?—lt’s three.等于三。
询问加法得数的句型为“What’s+数词+and+数词?(….….加.……等于.…..…? )”，其答语为“It'S+数词.”。[例句]—What's three and five?三加五等于几?
—Is eight.等于八。