(the) shifting sands (of something)
used to describe a situation that changes so often that it is difficult to understand or deal with "it"
https://www.oxfordlearnersdictionaries.com/definition/english/shift_1?q=shift 1
In the above explanation, is “it” necessary?
No. Good catch.
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When we construct the ‘so that’ clause, I think we need to use the object so as to make the meaning clear. It is not necessary in a ‘too … to’ construction.
Compare:
The situation changes so often that it is difficult to understand or