The following is a sentense about which I am not very clear:
'For our purposes, we define sustainable agriculture as does Pierre Crosson of Resources for the future.......'
My question is, if you and me have the same definition about something, should I say 'I define something as you do' or 'I define something as do you'. The first one seems naturer to me, if it is correct, how could you explain the above sentence?
Thank you in advance for help and any information involving with above question.
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The subject and the verb are often inverted in an as clause when the author wants to emphasize it.

[No inversion]
We defined sustainable agriculture as Crosson does.
He will play in the tournament this year as I will.
[With inversion]
We defined sustainable agriculture as does Crosson.
He will play in the tournament this year as will I.

There are some possible differences of meaning in this structure, though:

a) [Verb phrase] as you do.
b) [Verb phrase], as do you.

With a), the meaning is 'I do something in the same way as you do':

1. I define X as you do = I define X in the same way as you do.

With b), the meaning is 'I do something, and you also do something':

2. I like cheese, as do you = I like cheese, and you also like cheese.

There is also another use of 'as you do' to be aware of, though it's mostly used in conversation:

c) [Verb phrase] – as you do – etc.

This is a humorous formation. The 'as you do' means 'as one is accustomed to do', but it is always used ironically and parenthetically: the verb phrase must relate to an activity that is unusual in some way, or prestigious, or slightly pretentious:

3. I was having tea with the Queen yesterday – as you do – when...
4. I was reading Dostoevski in the original Russian yesterday (as you do), when...

This may be BrE only. I should say that the humour is now a little faded...so perhaps it's best avoided.

The punctuation does vary, in these phrases – not everyone will put a comma after the verb phrase in b), for instance.

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Hi, MP.

Regarding your example b), shouldn't it be 'so do you' instead of 'as do you'?
Can 'as' take place of 'so'?
Hello komountain,

That is indeed another formation, though 'and' usually precedes it, unless it's said by a 2nd speaker:

1. I like cheese – and so do you.
2. "I like cheese." "So do I."

'...as do you' in sense b) is probably less common than the 3rd person versions, e.g.

3. I like cheese – as does MrQ.

Thanks, MP.

Glad to learn more, yet I still find myself scratching my head.

'as' in your example a) means 'the same way/manner as...'
'as' in b) means 'also' or 'too.'

I understand the concept of the word 'as' in your examples a) and b) is slightly different.
But even if you say, "I like cheese as you do," it could mean that "you too like cheese", not necessarily that "I like cheese the same way you like it." I find a little solace, though, in your statement that the 2nd person version is less common. Is it something so delicate as to be beyond a non-native speaker's understanding?

Now, in case of the 3rd person version, is the formation "...., as does he" acceptable? To me, "...., as he does" rings more familiar. When the subject here is a personal pronoun, shouldn't it be formatted as "as he does" rather than as "as does he"? (If the subject is not a pronoun, you may go either way, "as does Komountain" or "as Komountain does.")

My questions seem a little desultory.
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Hello MrP

Do you have a feeling that the construct of "We define it as does he" (that was given in Jacklong's posting) is rather a rarely used construct, not to say, ungrammatical? I answered to Jacklong on a supposition that the Jacklong's sentence is an authentic one but now I feel it might be somehow wrong. Could you confirm it?

Hello Komountain

I think you are right. If we take "do" in "so do you" as a proverb, not an auxiliary verb, "so do you" belongs to rare use. English people often say "So said the King", but seldom do they say "So said he". It is a relic of the fact that at the time of Old English people took the combination of a pronoun and a verb as a single word.

Hello Paco

To my mind, 'I define something as do you' only becomes possible if we add a comma, dash, or semi-colon after 'something':

1. I define something, as do you.

Even then, we have to struggle to find a context. Perhaps two professors of philosophy or mathematics are comparing notes on how they would begin setting out a proof:

"I must admit, I've never read one of your proofs. How do you usually begin?"
"Me? Oh, I define something – as do you."
"What? You mean you've read some of my little papers? How immensely flattering..."

As you can see, it's a rather improbable scenario; possibly because we rarely have to tell someone how they do something.

But it would be a more common construction in the 3rd person, e.g. "I like to do XYZ, as does MrQ".

Hello Komountain

On the contrary, your questions are very much to the point. I'll have to go away and think a little before replying...

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