1.A+谓语+倍数+as+形容词/副词原级+as+BOur classroom is three times as big as their classroom我们班的教室是他们班的三倍2.A+谓语+倍数+形容词/副词比较级+than+BOur classroom is two times bigger than their classroom我们班的教室比他们班的大两倍(比他大两倍就是是他的三倍的意思)3.A+谓语+倍数+the+名词+of+BOur classroom is three times the bigness of their classroom 我们班的教室是他们班的三倍