～てからでないと／からでなければ
te kara denai to
Not until after; unless one first does
Formation 接続
Full formation notes
Te-form verb + からでないと/からでなければ, followed by a negative, inability, or restriction.
Explanation 説明
State that the first action must be completed before the next one is possible or permitted. The following clause is often negative, restrictive, or about difficulty. It sets a prerequisite rather than merely a sequence with te kara.
Examples 例文
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予約をしてからでないと、この店には入れません。
You cannot enter this restaurant unless you make a reservation first.
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説明を読んでからでなければ、機械を使ってはいけません。
You must not use the machine until you have read the instructions.
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実際に見てからでないと、買うかどうか決められません。
I cannot decide whether to buy it until I see it in person.
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熱が下がってからでなければ、学校へは行けません。
You cannot go to school until your fever has gone down.
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全員の意見を聞いてからでないと、結論は出せません。
We cannot reach a conclusion until we have heard everyone's opinion.
How related patterns differ 比較
てからでないと requires completing one action before another becomes possible. ないことには states a necessary condition more generally. わけにはいかない emphasizes a restriction from duty or principle even when an action is physically possible.
| Pattern | Meaning | Example |
|---|---|---|
| ～てからでないと／からでなければ | Not until after; unless one first does | 予約をしてからでないと、この店には入れません。 You cannot enter this restaurant unless you make a reservation first. |
| ～さえ～ば | As long as; if only a minimum condition is met | 田中さんは暇さえあれば、本を読んでいます。 Whenever Mr. Tanaka has any free time, he reads. |
| ～としたら | If we suppose that; if it were the case that | 彼女に誕生日プレゼントをあげるとしたら、何がいいと思う？ If you were to give her a birthday present, what do you think would be good? |
| ～ても | Even if; even though; related permission expressions | クラスでスマホを使ってもいいですか。 May I use my smartphone in class? |
| ～ないことには | Unless; without first doing | 実際に使ってみないことには、便利かどうか分かりません。 Unless I actually try it, I cannot tell whether it is convenient. |
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