Petrol is three times what it was a few years ago in China.

The price of Petrol is three times as much as it was a few years ago in China.

修改后属于：基数词+times +as +adj.+as 结构

以上句子结构使用“基数词+times + what 从句”：

The length of the road is four times what it was three years ago.

这条路的长度是三年前的 4 倍。

The price of the meat is twice what it was last year.

肉价是去年的两倍。

倍数表达法 引导比较状语从句归纳如下：

(1)A+基数词+time as +形容词/副词原级+as +B(A是B的几倍）

在这种结构中，比较成分的前面常用表示倍数的词如···times（···倍），twice（两倍）等来表示相比较的两个成分相差的倍数，通常译作“像···几倍那样多”，“是···的几倍”。

“… times +as + 形容词 / 副词的原级＋ as …”

This table is three times as long as that one.

这张桌子是那张桌子的三倍长。

The speed of sounds in water is about four times as great as in air.

声音在水中的速度是空气中的4倍左右。

This book is twice as thin as that one.  

这本书的厚度是那本书的二分之一。

This room is three times as large as that one

这间屋子是那间的三倍大。

This red box is half as large as the blue one

这个红色盒子是那个蓝色盒子的一半大

This dictionary is five times as thick as the one you borrowed from the library.

这本词典的厚度是你从图书馆借的那本（厚度）的 5 倍。

This table is three times as long as that one.

这张桌子是那张桌子的三倍长。

(2)“… times ＋形容词 / 副词的比较级＋ than …”

This hall is five times bigger than our classroom.

这个大厅比我们的教室大 5 倍。

(3)A+基数词+times +名词/代词+of +B(A是B的几倍）

“… times + the + 名词（如： size， height， weight， length， width 等）＋ of …”

The earth is 49 times the size of the moon.

地球的体积是月球的 49 倍。

This river is three times the depth of that one.

这条河是那条河的三倍深。

The age of my grandpa is four times the age of mine

=The age of my grandpa is four times that of mine

=My grandpa is four times as old as I

我爷爷的年龄是我的4倍。

(4)A+基数词+times +比较级+than+B(A比B《大，小，长》几倍）

This hole is five times deeper than that one

=This hole is six times as deep as that one

=This hole is six times the depth of that one

这个洞是那个洞的6倍深。

Their room is twice bigger than ours.

Their room is twice as big as ours.

Their room is twice the size of ours.

Length /height/weight/ width

他们的房子是我们的两倍.

(5)“… times + more ＋名词＋ than …”

He earns five times more money than he did ten years ago.

他现在挣的钱比十年前挣的多 5 倍。

There are twice more students in our class than in theirs.

我们班的学生人数比他们班多两倍。

(6). “… times +as many （或 much ）＋名词＋ as …”

We've produced twice as much cotton this year as （ we did ） ten years ago.

今年我们生产的棉花比十年前多了一倍。（汉语中的多一倍实际上也指两倍一样多。）

He has got three times as many books as his sister.

他拥有的书的数量是他妹妹的 3 倍。

(7) “… times + what 从句”：

The length of the road is four times what it was three years ago.

这条路的长度是三年前的 4 倍。

The price of the meat is twice what it was last year.

肉价是去年的两倍。

(8) “… times + up on （或 over ）…”

The size of the sun is a million times over that of the earth.

太阳的体积比地球的体积大一百万倍。

He is three times up on your age.

他的年龄是你的 4 倍（或：比你的年龄大 3 倍）。

(9) “… +by + … times ”

Compared with last year， our coal output has increased by three times.

与去年相比，我们的煤产量增长了 3 倍。

His speed is faster than mine by four times.

他的速度比我的快 4 倍。

(10)“… times + compared with ＋被比较对象”：

The number of the students in our school has increased four times compared with 1980.

我们学校的学生人数比 1980 年增加了 3 倍。

(11). “… times + that of + 被比较对象”：

In this workshop the output of July was 3.5 times that of January.

这个车间七月份的产量是元月份的 3.5 倍。

(12)用分数、百分数表示倍数。：

The box is one-third bigger than that one.

这个盒子比那个盒子大三分之一。

Last year the output value of industry was 59 percent higher than that of 1976.

去年工业产值比 1976 年增长了 59 ％。

My command of English is not half so good as yours.

我英语掌握得还不及你的一半儿好。

(13)用 again （一倍）， double （两倍）， triple （三倍）， fourfold （四倍）等词表示倍数。：

My Aunt is as old again as I am.

我姑姑的年龄比我大一倍。

The top-brand clothes are often sold as double the normal price here.

这里名牌衣服的售价经常比正常的售价高一倍。

The new work procedure tripled the output.

新工艺使产量增加了两倍。

The output of grain increased fourfold.

粮食产量增加了三倍。

Petrol is three times as what it was a few years ago in China.

这个句子不正确，漏掉了有关成分。

“在中国，汽油是几年前的三倍。”—— 什么的三倍：价格？消费量？开采量？

可能的修改是：

Petrol is three times as expensive as it was a few years ago in China. 

在中国，汽油价格是几年前的三倍。