The curves were smooth only whe seen from a distance, The poeple climbing them learned that they were treacherous, jagged things - hot to the touch, often unstable- eager, should certain important rocks be disturbed, to tumble some more, to form lower, more solid curves.
Question : If the setence italicized is subjunctive mode, where is the subject and the predicate?
What you have highlighted is not a logical whole or constituent of the sentence. e. they would tumble if certain important rocks were to be disturbed)
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What you have highlighted is not a logical whole or constituent of the sentence. The meaning of the relevant part is:
they (the curves) were eager to tumble some more, to form lower, more solid curves,
should certain important rocks be disturbed
(i.e. they would tumble if certain important rocks were to be disturbed)