1. 他的蛋糕是我的四倍大。

[ tā de dàn gāo shì wǒ de sì bèi dà 。 ]

His cake is four times as big as mine.

2. 他的蛋糕比我的大三倍。

[ tā de dàn gāo bǐ wǒ de dà sān bèi 。 ]

His cake is three times bigger than mine.