could we use "would" or "would have" to talk about future or past predictions/estimations or uncertainties/probabilities when we're not quite certain if something in question will happen or have happened?
"It's anticipated that by 2050 the number of people aged 15-49 would predominate.
"The bridge would probably fall by next year. It's so old"
"There are plans to upgrade the lobby so that the gallery would include an education facility with an adjacent storage and plant room"
"they say that the humanity would be able to to send manned missions to Mars in 10 or 15 years"
"Australopithecus Aferensis had much longer arms and larger hands, which would have been useful for climbing trees"
1. This is not right. " 2.
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1. This is not right. It should be "...will predominate."
2. This is not right. It should be "...will probably fail.."
3. This is not right. It should be "...the gallery will include..."
4. This is not right. It should be "...humanity will be able..."
5. This correct.
The following are examples of correct versions of sentences 1 to 4:
1.