do you know our school will be enlarged soon

A is three times the size of B
A is three times as large as B
A is three times larger than B
三种表达方式

一看就觉得是中国式的英语，一般将什么东西放大叫enlarge，比如你的身体的某一器官增大，学校规模扩大一般用expand更恰当

three times as large (big) as (the old one)
将扩大到原来的三倍，这样一说就知道了吧？是同级比较

固定用法,共三个那.都得背

了解一下倍数表示法吧,

1."A + be + 倍数 + as + 计量形容词原级 + as + B".
This tree is three times as tall as that one. 这棵树是那棵树的三倍高。
His father is twice as old as he. 他父亲的年纪有他两倍大。

2."A + be + 倍数 + 计量形容词比较级 + than + B "
The Yangtze River is almost twice longer than the Pearl River.
长江差不多比珠江长两倍。
The dictionary is exactly five times more expensive than that one.
这本字典比那本恰好贵5倍。

3."A + be + 倍数 + the + 计量名词 + of + B "
The newly broadened square id four times the size of the previous one.
新扩建的广场是未扩建时的四倍大。

4."The + 计量名词 + of + A + be + 倍数 + that + of + B "
The size of the newly bro