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Dear Friends,

I would like to how "Would" can be used in future perfect as a modal verb.

For Example.

Analysts predicts that world population would have risen considerably by 2010. (Prediction can be wrong, so using "Would" instead of "Will" means this sentence is less directive than the below one which is using "Will" )

Analysts confirms that world population will have risen considerably by 2010. (here analysts are confirming the likelihood of world population being increased by 2010).

But both of them are pointing to future. Are these sentences correct ? Can we use "Would" in future perfect in this way to mean something less likely to happen in future.

Or consider this:

Day "begins" at about 09:00 after 4 hours of sleep. So after doing the customary check on emails and stuff like that, I pack up all the rest of the stuff I have (computer being last, obviously) and then leave home.

So on the way to the airport, I finally manage to get Kara's number (to wish her a happy early birthday since I would have left by that time) through Linda -> Connie -> Bonnie. (I guess, speaker was not very sure that he would have left by that time, so he used would have left instead of will have left). Is my understanding correct ?

Another Example:

My company will have allocated 50 shares for me by Jan 2007, but it's of no use for me as i would have left the cmopany by that time. (Here again speaker is not sure whether he/she would be out of the company before Jan 2007, other Will could have been used instead of Would have).

Please let me know whether my understanding is correct ?

Regards

Sabya


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Comments  (Page 2) 
Thanks Marius and Chad for your reply. I have used "Would have" because it's a fuure perfect.

Analysts predict that world population would have risen considerably by 2010.

or

Analysts confirm that world population will have risen considerably by 2010.

You are correct, i can use Could or Might also. But i guess using Would in this context won't be illegitimate.

"Would have" is generally used in Past unreal conditional, but here the meaning is completely different. We are using "Would have" just to show that analiysts are not very sure if the population will really have risen considerably by 2010 (it's less definite or less directive). This kind of usage of "Would have" in future perfect is not very common (I didn't find many in google) that is the reason i asked if it's legitmate.

Regards,

Sabya
No, I do NOT think your uses here are correct:

Analysts predict that world population would have risen considerably by 2010.
Analysts confirm that world population will have risen considerably by 2010.


Show me some examples on the web.
IMO, would have/will have doesn't work this way with "to predict".

You could say, however:

Analysts have found that their world population estimates would have
risen
considerably by 2010, had the birth rate been increased by 25%.

Analysts have confirmed that their world population estimates would have
risen
considerably by 2010, had the birth rate been increased by 25%.


but this is very different. This shows that one of their estimates for 2010 would have to be changed, should changes be introduced in the birth rate (i.e. IF there are changes in the birth rate).

However, because this is an hypothetical change (in their calculations/estimates), I think that only would would work, not will. Would have is hypothetical, and one must clearly state the reasons/conditions for it, which I am doing here by that final had part of the sentence, and you're not doing.
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1.

Another conditional example (this is from the Web) with predict and would have:

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The researchers predict that given enough generations the red-eye gene would eventually have been present in every individual in the sexual fruit fly population. Moreover, they predict that [the same conditions are implied] it would have disappeared in the asexual population.

http://tinyurl.com/yx6gp8
-----
The condition here is given enough generations the red-eye gene.

2.

www.myspace.com/73077

I can predict that it would have been his best work had he lived long enough to finish it. As it is, however, he didn't and the last two and a half chapter ...


Thanks a lot Marius.