Grammar
N3 conditional

Unless 〜ないことには

Meaning

"Unless ~", "without first ~ing" — nothing can proceed until this happens.

Formation

Notes

The second clause is almost always negative or an impossibility: 見ないことには分かりません. It marks a precondition without which the rest cannot even begin, which is stronger than a plain 〜なければ.

Examples

I cannot tell unless I actually see it.

Breakdown
do not actually see unless cannot tell

You cannot know if it is good unless you try it.

Breakdown
do not try eating unless whether it is good

We cannot start unless we get permission.

Breakdown
do not receive permission unless cannot begin

Without your health you can do nothing.

Breakdown
not healthy unless can do nothing

You cannot judge a person's character without meeting them.

Breakdown
do not try meeting unless character

⚠️ Often confused with

Conditional と (whenever / when)

Two uses: (1) natural/habitual consequence — "whenever A happens, B happens"; (2) discover...

Conditional 〜ば (if / whenever)

A general conditional — "if A, then B". Formed from the hypothetical form (仮定形) of the...

Conditional 〜たら (if / when / after)

The most versatile conditional. "If/when A happens, B". Formed from the ta-form stem + ら....

Conditional 〜なら (if / given that)

A conditional based on the listener's stated or known information — "if it's the case that...

Even if 〜ても

"Even if A, B" / "no matter if A". Indicates that B happens regardless of A. The result is...

In case 〜場合は

"In the event that ~ / in the case that ~". Used to discuss what to do in a particular (of...

Supposing 〜としたら

"Supposing ~", "if we assume ~" — reasoning from a hypothetical.

Not until 〜てからでないと

"Not until ~", "unless ~ is done first" — a precondition that must come first.

If only 〜さえ〜ば

"If only ~", "as long as just ~" — one sufficient condition.