〜ないことには means "unless" or "without" — establishes X as a necessary condition for Y.
Prerequisite - Unless X happens, Y won''t happen
Necessity - Without doing X, can''t do Y
You won''t know unless you actually try.
Often followed by negative outcome or uncertainty.
Verb ない-form + ことには
Often followed by negative:
- ないことには〜ない (unless X, can''t Y)
- ないことには〜わからない (without X, don''t know)
I can't judge without meeting them.
You won't succeed unless you make an effort.
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