てからでないと

must first do, cannot do without first doing, unless cannot, until cannot

AI-generated

Structure

[verb て-form] + からでないと + [negative expression] [verb て-form] + からでなければ + [negative expression]

Description

The grammar structure てからでないと expresses that unless a certain action is done first, something else cannot happen. It emphasizes that a prerequisite must be fulfilled before the next step is possible. The clause that follows is always negative – expressing impossibility, prohibition, or undesirability.

It can be broken down as: ぼるとVて + から (after) + でないと (if not) – literally "if it is not after doing ~", meaning "unless ~ is done first".

、。

I can't decide unless I look into it thoroughly first.

、。

You must not eat unless you take your medicine first.

Usage notes

The result clause (the second part) is always negative – typically ending in expressions like 〜～ない, 〜～できない, 〜～てはいけない, or 〜～わからない.

、。

You won't understand the difficulty unless you actually try it first.

Alternative forms

There are several variations with the same meaning:

てからでなければ – slightly more formal
てからでないと – standard/neutral
てからじゃないと – more casual/colloquial

、。

You can't get in unless you make a reservation first.

All three convey the same idea: a necessary precondition must be met before something else is possible.

Examples

、。

You can't use this machine unless you read the manual first.

、。

You can't go out to play unless you finish your homework first.

、。

I can't decide unless I consult my parents first.

、。

I can't believe it unless I see it with my own eyes first.

、。

You cannot start working unless you sign the contract first.

、。

You must not eat unless you wash your hands first.

、。

You can't play in the match unless you practice properly first.

、。

The meeting won't start unless everyone is here first.

、。

We won't know if it's correct unless we confirm with the person first.

、。

You can't proceed to the next step unless you submit this document first.

、。

We can't reach a conclusion unless we discuss it properly first.

、だろう。

We probably won't understand the situation unless we go there first.

References

てからでないとBunpro

ている場合じゃない

できれば / できたら