If hypothetical, Would Vs Will

[vinay2]

From Kaplan 800:

Some analysts warn that, if the "numbers prove to be accurate", the entire SS system _________ in danger of failing.

(D) would continue to be
(E) will continue to be

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I would like to know why D is incorrect. Per MGMAT, "If she ate pizza tomorrow, she would fall sick" is a correct sentence. Then, why isnt D? (If hypothetical event, X would Y).

Perhaps "prove to be accurate" is not in the hypothetical-past tense? Should it be "numbers were accurate" or "numbers proveD to be accurate" to make D correct? or perhaps "if someone proved the numbers to be accurate"?

Another reason why would seems appropriate here is that this is a prediction and doesn't seem 100% certain given the statistical nature.

Can someone please provide a clear rule of thumb on when to use will and when to use would, for a sentence:

If X (in the future), then Y would/will Z

[Jim@Grockit]

From Kaplan 800:

Some analysts warn that, if the "numbers prove to be accurate", the entire SS system _________ in danger of failing.

(D) would continue to be
(E) will continue to be

------------

I would like to know why D is incorrect. Per MGMAT, "If she ate pizza tomorrow, she would fall sick" is a correct sentence. Then, why isnt D? (If hypothetical event, X would Y).

Perhaps "prove to be accurate" is not in the hypothetical-past tense? Should it be "numbers were accurate" or "numbers proveD to be accurate" to make D correct? or perhaps "if someone proved the numbers to be accurate"?

Another reason why would seems appropriate here is that this is a prediction and doesn't seem 100% certain given the statistical nature.

Can someone please provide a clear rule of thumb on when to use will and when to use would, for a sentence:

If X (in the future), then Y would/will Z

"Would" is used in counterfactual future conditions -- ones known to be false or at least highly unlikely. "Will" is used in factual future conditions -- ones known to be true, always true, or at least highly likely.

If she keeps eating pizza, she will get sick. (factual: we have no reason to believe she won't get sick if she doesn't stop)
If she kept eating pizza, she would get sick (but we don't expect that to happen for whatever reason)

The counterfactual future conditions require the use of the simple past in the "if" clause.

[vinay2]

Great, thanks Jim - "lack of uncertainty" and "lack of simple-past in the if" clearly explains why it should be E and not D.

[selango]

Use will to refer to some event that will happen in the future in relation to the present and use would to refer to the future in the past.

[anyuta3]

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