Breakdown of Yksikään talo ei ole sortunut.
olla
to be
talo
house
ei
no / not (negative verb)
sortua
to collapse
Questions & Answers about Yksikään talo ei ole sortunut.
What is the difference between yksikään and mikään in this context?
While mikään can simply mean any or no (as in mikään talo ei... meaning no house...), yksikään translates strictly to not a single one or not even one. It gives much stronger emphasis that absolutely zero houses collapsed.
How exactly is the word yksikään formed?
It is made of the number yksi (one) plus the suffix -kään. This suffix is the negative version of -kin (also/even). When attached to yksi in a negative sentence, it literally means not even one.
Since this is a negative sentence, why aren't yksikään and talo in the partitive case?
The rule that negative sentences require the partitive case applies to the object (target) of the sentence. Here, yksikään talo is the subject. Subjects typically stay in the nominative (basic) case even when the sentence is negative.
Why use ei ole sortunut instead of just ei sortunut?
This sentence is in the negative present perfect tense (has not collapsed), which is formed with ei ole plus the past participle sortunut. If it were just ei sortunut, it would be the simple past tense, meaning did not collapse.