Breakdown of Selvityksen tulee olla valmis perjantaihin mennessä.
olla
to be
valmis
ready
perjantai
Friday
mennessä
by (a deadline)
Questions & Answers about Selvityksen tulee olla valmis perjantaihin mennessä.
How does tulee olla differ from täytyy olla?
They both mean "must be", but using tulee + 1st infinitive is a more formal, administrative way to express necessity. You will often see it in official rules, contracts, or workplace instructions. Just like täytyy, it requires the subject to be in the genitive case (selvityksen).
Why isn't the subject in the nominative case (selvitys)?
Because this is a necessity sentence. Whenever you use a necessity construction like tulee, täytyy, or pitää, the logical subject of the sentence must be in the genitive case. That is why it is selvityksen.
Why do we use the word mennessä to mean "by" Friday?
mennessä is a postposition used specifically for deadlines. It is a form of the verb mennä (to go) and literally implies "while going to". It always requires the time word before it to be in the illative case, which is why we use perjantaihin.
Does selvitys always mean "report"?
Not exactly. While it translates to "report" here, selvitys comes from the adjective selvä (clear). It broadly refers to a clarification, explanation, or an investigative study that clears an issue up. It is very common in official or professional contexts.