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I am not sure about the correct grammar of this phrase. For example:
It was not until 2010....

A.did the family reunite
B.that the family reunited

I instinctually answered A when I saw this question. "It was not until 2010 did the family reunite."

However, I was suspicious about my answer after seeing a number of people answering B, thinking twice again, B could be right too, that is why I am posting this question here.

Which is the grammatically correct answer? and why? Thanks.
Comments  
Hi,

I am not sure about the correct grammar of this phrase. For example:

It was not until 2010..

A.did the family reunite
B.that the family reunited

I instinctually answered A when I saw this question. "It was not until 2010 did the family reunite."

However, I was suspicious about my answer after seeing a number of people answering B, thinking twice again, B could be right too, that is why I am posting this question here.

My first choice would be B, but I wouldn't say A is wrong or incorrect.

Which is the grammatically correct answer? and why?

I would simply say that A is a more idiomatic and more literary wording, while B is more straightforward and conventional, and hence more common.

Clive
Thanks for replying.
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There is no inversion for negation in the highlighted element of a cleft structure (It is/was not ... that ...):

It was not until 2010 that the family reunited.

Without a cleft structure, initial negations trigger inversion:

Not until 2010 did the family reunite.
_______________

You can form both of these structures for most negations.

The hunters didn't return until Monday.
It was not until Monday that the hunters returned.
Not until Monday did the hunters return.
_______________

The same applies for "only":

It was only after it was too late that Jenny applied for the exemption.
Only after it was too late did Jenny apply for the exemption.

CJ
Thank you very mich. This is perfect explanation and really helpful distinguishing three other possible forms (which you showed) and using them all correctly.
I see this is an ancient thread, but (A) sure sounds incorrect to me. While you can of course say "Not until 2010 did the family reunite", can you really say "It was not until 2010 did the family reunite"?
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GPYcan you really say "It was not until 2010 did the family reunite"?
No.
GPY (A) sure sounds incorrect to me.
It is incorrect.

CJ
The correct answer is B
As the form: It was not until......that S+ Ved....
If the answer were A the form must be: Not until........did S + V....(means u have to use inversion when u place "Not until.." at the beginning of a sentence.
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