Hello! I am not a teacher but I would say, "All our preparation s were for nothing". Anyway, the phrase "All our preparation for nothing" doesn't seem correct to me.
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Aya-sanHi teachersI guess there's no need of saying "was"... I get the very same meaning...
The following is from my English textbook.
" No one came to our party. All our preparation for nothing."
Shouldn't the latter sentence be "All our preparation was for nothing."?
Aya