〜てからでないと means "not until after" or "unless X first" — establishes a prerequisite.
Prerequisites - Must do X before Y is possible
Sequence requirement - Y won''t happen without X first
Not until after hearing the explanation can I judge.
Formal. Casual: てからじゃないと
Verb て-form + からでないと
Variants:
- てからでないと (formal)
- てからでなければ (formal)
- てからじゃないと (casual)
You won't understand until you actually try.
You can't get in unless you reserve first.
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