Sentence ending のを(だ)


I do not understand the meaning of のを:

> a. 彼は家を買った。 しかも大きい庭付きのを(だ)。 (だ is indicated as optional)

Is it different from:

> b. 彼は家を買った。 しかも大きい庭付きだ。 (I'm not sure if this is grammatical)
>
> c. 彼は家を買った。 しかも大きい庭付きのだ。

What does it mean when the copula takes on a direct object? I have so far only
encountered `AはBだ`, `AがBだ`, `Bだ` but I have not seen を directly preceding the
copula before.




It is a (pseudo) cleft sentence with the noun phrase and the topic ellided. I
thought there was a variety among native speakers who accept `を` and who
don't.

> しかも、かれは大きい庭付きの家を買った  
>  'In fact, he bought a house that has a large garden.' (Original sentence)
>
> しかも、彼が買ったのは大きい庭付きの家(を)だ  
>  'In fact, what he bought was a house that has a large garden.' ((Pseudo)
> cleft)
>
> しかも、彼が買ったのは大きい庭付きの(を)だ  
>  'In fact, what he bought was one that has a large garden.' (Ellipsis of a
> noun phrase)
>
> しかも、大きい庭付きの(を)だ  
>  'In fact, (what he bought was) one that has a large garden.' (Ellipsis of
> the topic)

It is different from the other sentence, in which simply `家` is ellided:

> しかも大きい庭付きだ  
>  'In fact, (it) has a large garden.'




It is a (pseudo) cleft sentence with the noun phrase and the topic ellided. I
thought there was a variety among native speakers who accept `を` and who
don't.

> しかも、かれは大きい庭付きの家を買った  
>  'In fact, he bought a house that has a large garden.' (Original sentence)
>
> しかも、彼が買ったのは大きい庭付きの家(を)だ  
>  'In fact, what he bought was a house that has a large garden.' ((Pseudo)
> cleft)
>
> しかも、彼が買ったのは大きい庭付きの(を)だ  
>  'In fact, what he bought was one that has a large garden.' (Ellipsis of a
> noun phrase)
>
> しかも、大きい庭付きの(を)だ  
>  'In fact, (what he bought was) one that has a large garden.' (Ellipsis of
> the topic)

It is different from the other sentence, in which simply `家` is ellided:

> しかも大きい庭付きだ  
>  'In fact, (it) has a large garden.'

