I think that "as expected" sounds less weird than "as expectation", but "as" is a preposition, so there should be a noun after it. Which is correct, as expected or as expectation?

Which is correct?

  • The planet should be observed on July 12 as expected.

  • The planet should be observed on July 12 as expectation.

  • I think it's an adverb and not preposition. As expectation is possible but in different context: As expectation weighed heavily on Nigeria at the tournament, they could not go beyond the group stage...
    – Maulik V
    May 31, 2014 at 10:14
  • There isn't enough context, which is why I've deleted my answer. It could be either, so please add the sentence this appears in, and preferably the one before and after it as well.
    – jimsug
    May 31, 2014 at 10:28
  • I edited my question.
    – Kevin Dong
    May 31, 2014 at 10:31
  • 2
    @KVD The part "which is correct, as expected or as expectation" is easy to answer. Unfortunately, the point you raised, "as" is a preposition, so there should be a noun after it, is quite difficult to answer, because it makes the answerer have to clarify what as functions as in as expected first. Is this as really a preposition? Is it an adverb? Is it a conjunction? It's difficult to pinpoint (at least for me, on feet). For example, consider this: "He walked across." What does this across function as? An adverb or a preposition? How about this: "He walked across the bridge."? May 31, 2014 at 20:59
  • 1
    I believe that when you said "as" is a preposition, so there should be a noun after it., you thought of something like "He worked as a designer." which doesn't apply to this case of as expected. In short, as doesn't always work as a preposition. May 31, 2014 at 21:02

5 Answers 5


As a general rule, never take some grammar rule you found somewhere, or that someone told you, and try to apply it indiscriminately to every sentence that you find. In this case, the grammar rule is not that "as is a preposition, therefore it takes a noun", but "if as is used as a preposition, it usually takes a noun".

I agree with the comments that as should not be seen as a preposition in this sentence.

Having a quick look at what the OALD has to say about this, when we look up as (preposition) we find:

1 used to describe somebody/something appearing to be somebody/something else
They were all dressed as clowns.
The bomb was disguised as a package.
2 used to describe the fact that somebody/something has a particular job or function
She works as a courier.
Treat me as a friend.

None of these sentences seems to follow the pattern of your as expected example.

Now, when we look at as (adverb) we find this:

1 as… as… used when you are comparing two people or things, or two situations
2 used to say that something happens in the same way
As always, he said little.
The ‘h’ in honest is silent, as in ‘hour’.

Now, in the sentence as always, he said little, I see the structure of your sentence; I can replace always with expected:

As always, he said little.
As expected, he said little.
As every morning, he said little.


We only say, "as expected."

a mannered way of saying it might be,

"As per expectation."


Correct examples:

  • As expected, the project went well.
  • As per my expectation, she completed the task on time.
  • Things went as expected.
  • Things went as per my expectation(s).
  • As a high/large/unreasonable expectation had been placed on the outcome, Sarah was disappointed.
  • Things did not go as Sarah had expected.

The correct form is "as expected" (in a way that was planned or thought likely to happen). To find the answer to your question, I guess it would be better not to look at it as a "preposition-noun" issue, as you mentioned. Consider it as the short form of "as is/was expected". It might help understand what's going on. Example:

As expected, the whole family was shocked by the news.

  • I don't think in your examples, As expected is an ellipsed form of As it is expected. I can imagine it being as would be expected, but it's easier just to see as as an adverb.
    – jimsug
    May 31, 2014 at 10:37
  • Why not "as it was expected, the whole family..."?
    – M.N
    May 31, 2014 at 10:43
  • As it was expected, unless it refers to a known piece of news, is ungrammatical (at least, to me - I don't think I have or would ever say that).
    – jimsug
    May 31, 2014 at 10:44
  • What's your take on this? "As expected, the party was a great success."
    – M.N
    May 31, 2014 at 10:48
  • You mean "as it is/was expected" is not grammatically acceptable?
    – M.N
    May 31, 2014 at 10:54

In my opinion, the very useful comment of Damkerng has the answer in it.

If you place expectation (a noun) after as, the as becomes preposition (line #3). This is what you stated in your question.

What the structure of as...[noun] conveys very first thing to us is... to be..

He acted as a clown

And certainly, this is not the case here.

So, to answer Which is correct, as expected or as expectation?... my vote to :

The planet should be observed on July 12 as expected.

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