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A. I haven't thought of that until now.

B. I hadn't thought of that until now.

1. Which is correct above with the expression "until now"?
2. If both are reasonably possible, what is the difference?
3. Which is more natural?
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Comments  
1. Which is correct above with the expression "until now"?- B

2. If both are reasonably possible, what is the difference?-- only B is reasonable.

3. Which is more natural?-- Only B is natural.
What is the point of using PAST PERFECT here? What if we use PAST SIMPLE

I didn't think about it until now.
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OK, too.
Thank you, M Micawber.
[Y]

PS: If someone could tell me the difference or the background which would predertermine the usage of PAST PERFECT here. The problem is that I don't see any difference while there must me some.

Thank you, Mister Micawber.
Mister Micawber1. Which is correct above with the expression "until now"?- B
2. If both are reasonably possible, what is the difference?-- only B is reasonable.
3. Which is more natural?-- Only B is natural.
In another example, I read somewhere else that the present perfect is the correct tense with the expression 'until now' below. I wonder why is C below, if you agree, is the correct one when B is the correct version between my original examples A and B. Please explain.

C. I have never felt so alone until now.
D. I had never felt so alone until now.
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AnonymousI read somewhere else that the present perfect is the correct tense with the expression 'until now'
Emotion: shake Not necessarily. Past perfect is also common, especially when the main clause is in past time. In these cases "until now" often, though not always, means "until that time", i.e., "until that point in the story". Here are some random examples gathered from Google.

Smith won a seat that had never until now been held by a Republican.

They were irked and insulted that Harper had stayed away until now.

He had resisted until now because he had felt he couldn't make them in an authentic way.

Until now it had been the boy's whole world, and it had seemed to be very big, but now the boy began to see how very small his village really was.

Until now, it had been widely assumed that the kind of mental ability that allows us to solve new problems without having any relevant previous experience is innate and cannot be taught.

Defence Secretary Geoff Hoon admitted the troops had been "frustrated" until now by the absence of any direct contact with Taliban or al Qaida forces.

... a potentially lucrative client that no one had heard of until now.

All along until now I had thought he was an outstanding player.

Until now, police had said only that she was "fully clothed".

McIntyre, who launched the site in February '06 and had remained anonymous until now, said ...

... and up until now I had not considered him to be in that category.

The marines have been in the country for several weeks, but until now they had not encountered any enemy forces.

CJ
Ok. What if NOW is in the PRESENT, do we also use PAST PERFECT? It seems like all NOWs in your example are in the PAST.
TicceIt seems like all NOWs in your example are in the PAST.
Not all, not necessarily. These would probably be interpreted as present time.

... a potentially lucrative client that no one had heard of until now.

All along until now I had thought he was an outstanding player.


McIntyre, who launched the site in February '06 and had remained anonymous until now, said ...

... and up until now I had not considered him to be in that category.


What strikes me is that they seem to focus on an almost sudden change of opinion or on the discovery or revelation of new information.

CJ
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