Japatan
Formação
- Vて形 + からでないと
- Vて形 + からでなければ
Explicação
Means "B cannot happen unless A is done first." The second clause is negative, such as できない, 分からない, てはいけない or 無理だ. からでなければ has the same meaning and is a little more formal. It shows that A is a necessary condition for B.
Exemplos
家族と 相談してからでないと、お返事できません。
I can't give you an answer until I've talked it over with my family.
実際に 使ってみてからでないと、いいかどうか分からない。
You can't tell whether it's good until you've actually tried it.
この部屋は、料金を 払ってからでないと使えません。
You can't use this room until you have paid the fee.
宿題を 終わらせてからでなければ、ゲームをしてはいけません。
You may not play games until you've finished your homework.
Observações
The second clause cannot be positive (such as できます or しましょう). てから simply shows order, while てからでないと shows that A is required first.
Gramática relacionada
Miniquiz
1商品を実際に見てからでないと、（ ）。
Resposta e explicação
Resposta: 3 買うかどうか決められない
"I can't decide whether to buy it until I've actually seen the product." The second clause must be negative.
2「今日、帰りにご飯行かない？」
「ごめん、この資料を（ ）、行けないんだ。」
Resposta e explicação
Resposta: 2 作ってからでないと
"Sorry, I can't go until I finish making these materials." 次第 is not followed by a negative like 行けない, and 以来 and どころか do not fit.
3入場券を（ ）からでないと、会場に入れません。
Resposta e explicação
Resposta: 1 買って
"You can't enter the venue until you buy an admission ticket." からでないと follows the て-form: 買ってからでないと.
