Like vs As

Like and as can both be used to compare things, but they are not interchangeable. The key difference is what kind of word or clause follows each one.

• She sings like an angel. (like + noun, describes a similarity)
• She works as a teacher. (as + noun, describes an actual role)
• Do it as I showed you. (as + clause, describes the manner of doing something)

Like: Followed by a Noun or Pronoun, Showing Similarity

Like is normally a preposition, followed by a noun, pronoun, or -ing form, and it introduces a comparison — one thing resembles another.

• He looks like his father.
• It sounds like rain outside.
• She's acting like a child.

As: Followed by a Clause, or Describing an Actual Role

As has two very different common uses:

1. As + noun = an actual role, job, or function (not just a resemblance):

• She works as a doctor. (she really is a doctor)
• He used the box as a table. (the box actually functioned as a table)

2. As + clause (subject + verb) = describing manner, in formal or neutral English:

• Do it as I showed you. (as + subject + verb)
• As she predicted, the plan failed.

The Classic Contrast: Like vs As with a Role

This is the most common point of confusion, because the two sentences look similar but mean very different things.

• As your teacher, I have to correct your mistakes. (I really am your teacher)
• Like your teacher, I also think grammar matters. (I am NOT your teacher, just similar in this opinion)

Informal Use of Like as a Conjunction

In informal, especially American, English, like is often used before a clause where formal English would require as. This is common in speech but generally avoided in formal writing.

• Informal: Nobody understands me like you do.
• More formal: Nobody understands me as you do.

Summary Table

Word	Followed by	Meaning	Example
like	noun / pronoun / -ing	similar to, resembling	She swims like a fish.
as	noun (role)	in the actual role of	She works as a lawyer.
as	clause	in the way that / because	Do as I say.

Common Mistakes

• Using like to describe a real role:
  Wrong meaning: Like your doctor, I recommend rest. (implies you are NOT the doctor, just similar)
  Correct if you are the doctor: As your doctor, I recommend rest.
• Using as before a simple noun comparison:
  Wrong: He looks as his brother.
  Correct: He looks like his brother.
• Using like before a full clause in formal writing:
  Too informal for formal writing: He did it like I asked.
  More formal: He did it as I asked.

Practice Exercises

Explore related grammar topics:

All Grammar Topics Conjunctions Prepositions Comparative Structures Subordinating Conjunctions Correlative Conjunctions

Frequently Asked Questions

What is the main difference between like and as?

Like is normally a preposition followed by a noun or pronoun, showing that one thing resembles another, as in "She sings like an angel." As can introduce an actual role or function ("She works as a teacher") or a clause describing manner ("Do it as I showed you").

What is the difference between 'as your teacher' and 'like your teacher'?

"As your teacher, I have to correct your mistakes" means the speaker really is the listener's teacher. "Like your teacher, I also think grammar matters" means the speaker is NOT the teacher but shares a similar opinion or quality with them. This distinction is one of the most important uses of as vs like.

Can as be followed by a noun?

Yes, when the noun describes someone's actual role, job, or function, not just a comparison: "He used the box as a table" means the box genuinely served as a table, not that it merely resembled one.

Can like be followed by a full clause (subject + verb)?

In informal speech, especially American English, like is often used before a clause, as in "Nobody understands me like you do." However, formal written English generally prefers as in this position: "Nobody understands me as you do."

Why is 'He looks as his brother' incorrect?

"As" should not introduce a simple noun comparison of resemblance; that is the job of "like". The correct sentence is "He looks like his brother," since it describes a similarity, not an actual role.

Is it correct to say 'Do it like I showed you'?

In informal spoken English, this is very commonly used and widely understood. In formal or written English, however, "Do it as I showed you" is considered the more correct and traditional choice, since a full clause follows.

What does 'as I predicted' mean, and why does it use as?

"As I predicted, the plan failed" uses as to introduce a clause describing something that happened in the way already stated. Since a subject and verb ("I predicted") follow, formal grammar calls for as rather than like.

Is like vs as grammar useful for English learners?

Yes, especially for learners working on more precise or formal English, since mixing up like and as can genuinely change the meaning of a sentence, not just its formality. The as your teacher / like your teacher contrast is a particularly important distinction to master.

Is using like instead of as always wrong?

Not always wrong, but it can be considered informal or, in some cases, ambiguous. In casual conversation, using like before a clause is extremely common and rarely causes confusion, but formal writing, academic work, and professional communication generally still prefer as before a clause.

Which use of like or as should I learn first?

Start with the clearest contrast: like + noun for simple resemblance ("She swims like a fish") versus as + noun for an actual role ("She works as a lifeguard"). Once that feels natural, move on to the more formal use of as before a full clause.