As和like经常被混淆，因为它们都可以用于比较。 然而，两者之间存在着重要的区别。

作比较

as + adjective + as 和 as much as

我们经常使用as +形容词+ as或as much as这个结构来表示某物是否具有或没有与另一物相同的质量。

She loves curry as much as I do.
He's not as tall as his brother.
It's not as expensive as the other hotel.
That dog is as big as that child!

你还必须在短语the same as中使用as。

Your phone is the same as mine.
Texting is not the same as speaking in person.

like +名词

在下面的比较中，like后面跟一个名词或代词，表示两件事相似，翻译成“像”。

He's like a father to me.
She's acting like a child.
It's like a burger but with big mushrooms instead of bread.
There are lots of people like us.

It is also common to make comparisons using like with verbs of the senses.

用like与感官动词进行比较也是很常见的。

She looks like her mother.
It sounds like a cat.
Nothing tastes like homemade lemonade.
It smells like medicine.
It feels like cotton.

as if （as though ）+ 从句

As if和As though可以用来比较真实的情况和想象的情况。 后面跟着从句(主语和动词)。

You look as if you've seen a ghost.
I felt as if I was floating above the ground.
You talk as though we're never going to see each other again.

用作举例

我们可以用like或such as来举例。

You could try a team sport like football, basketball or hockey.
You should take something soft, such as a towel, to lie on.

谈论工作或功能

我们可以用as +名词来谈论一项工作或功能。

I worked as a shop assistant for two years.
He used his coat as a blanket to keep warm.

As用于连接两个短语

As可用作连词连接两个短语。 它可以有不同的含义。

as = 'because'

All the tickets were sold out as we got there too late.
As the road was closed, I had to park on the next street.

as = 'while' 或 'during the time that'

She called as I was getting out of the bath.
As they were arriving, we were leaving.

as = 'in the way that'

As we expected, it started to rain.
As you know, classes restart on 15 January.
As I said, I think this project will be a challenge.