The conditional perfect passive negative (ei olisi tehty)

To talk about what would not have been done in a hypothetical past scenario, use the negative conditional perfect passive.

Forming the Negative

Combine the negative word ei, the conditional auxiliary olisi, and the passive past participle (ending in -tu or -ty).

VerbPassive Past ParticipleNegative Conditional Perfect PassiveMeaning
laukaistalaukaistuei olisi laukaistuwould not have been launched
keskeyttääkeskeytettyei olisi keskeytettywould not have been aborted
välttäävältettyei olisi vältettywould not have been avoided
pelastaapelastettuei olisi pelastettuwould not have been rescued

The Partitive Object Rule

Because these sentences are negative, the object receiving the action must be in the partitive case. Notice how avaruusalus (spacecraft) becomes avaruusalusta, and katastrofi becomes katastrofia:

The spacecraft would not have been launched without you.
Avaruusalusta ei olisi laukaistu ilman sinua.
The catastrophe would not have been avoided without the captain.
Katastrofia ei olisi vältetty ilman kapteenia.
The crew would not have been rescued without new oxygen.
Miehistöä ei olisi pelastettu ilman uutta happea.

Hypothetical Conditions with "Jos"

This structure frequently pairs with jos (if) clauses to explain the exact conditions that prevented an action:

The flight would not have been aborted if the oxygen had not run out.
Lentoa ei olisi keskeytetty, jos happi ei olisi loppunut.
The mission would not have been cancelled if the captain had known the truth.
Tehtävää ei olisi peruttu, jos kapteeni olisi tiennyt totuuden.
If the flight had not been aborted, the satellite would have exploded.
Jos lentoa ei olisi keskeytetty, satelliitti olisi räjähtänyt.