Breakdown of De formule is makkelijk, dus de oplossing moet hier zijn.
zijn
to be
hier
here
makkelijk
easy
moeten
to have to, must
Questions & Answers about De formule is makkelijk, dus de oplossing moet hier zijn.
Why does moet mean "must" here instead of its usual meaning of "have to"?
While moeten usually expresses a strict obligation (having to do something), it is also used for logical deductions. Just like in English, you use it when you are highly certain about a conclusion based on evidence: because the formula is easy, you deduce that the solution "must" be right there.
Does the word dus change the word order here?
It can, but it doesn't have to! Dus (so/therefore) is a flexible word. Here, it acts as a coordinating conjunction (like en or maar), keeping the normal Subject-Verb order (dus de oplossing moet...). But you could also treat it as an adverb, which flips the subject and verb (dus moet de oplossing...). Both versions are completely correct in Dutch.
Why is the verb zijn placed at the very end of the sentence?
This is the standard rule for modal verbs like moeten. In a main clause, the conjugated modal verb (moet) takes the second active position, and the main action verb—here, the infinitive zijn (to be)—gets pushed to the very end of the sentence.
What is the difference between makkelijk and gemakkelijk?
There is no difference in meaning; both mean "easy". Makkelijk is just a slightly shorter, more everyday version of gemakkelijk. You can use them interchangeably in almost any situation.