imagine there having been/ What would they have done if it had been about to crash

matar0

Senior Member
Italian, Italy
Are the following sentence correct? (using the structure: Imagine+Verb-ing) :
Imagine there being an earthquake in London tomorrow, what would happen then?
Imagine the rainforests disappearing tomorrow, what would happen then?

my native teacher taught me this usage and I'm quite confident it is correct.

Besides, Are the following sentences in 3rd conditional correct?
Imagine there having been an earthquake in London yesterday, what would have happened then?
Imagine the rainforests having disappeared yesterday, what would we have done then?

Which is the corresponding form in the past of "Were the rainforests about to disappear" ? Can we say "If the rainforests had been about to disappear in the stone age, our ancestors would have all died, and we wouldn't be here now"? Or: "Were the rainforests have been (about) to disappear in the stone age?".
What about:
What would they have done if the building had been about to crash?

Thank you
 
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