De werkomstandigheden waren zwaarder en moesten worden gecontroleerd.

Questions & Answers about De werkomstandigheden waren zwaarder en moesten worden gecontroleerd.

Why do we use worden here instead of zijn to form the passive?
When combining a modal verb like moeten (must/have to) with the passive voice, you use the infinitive worden (to be) plus the past participle (gecontroleerd). Because the modal verb is already in the past tense (moesten), the passive action itself just acts as the infinitive phrase "to be checked".
Why are worden and gecontroleerd pushed all the way to the end?
In Dutch main clauses, the conjugated verb (moesten) takes the standard second position, while all other verbs in the chain are sent to the end. Here, the infinitive worden and the past participle gecontroleerd cluster together at the very end of the sentence.
Why doesn't the second half of the sentence have a subject?
The subject for both halves is de werkomstandigheden. Because the subject is exactly the same and the clauses are joined by en (and), you can simply leave it out the second time. This works just like it does in English: "were tougher and [they] had to be checked."
Why does zwaarder mean "tougher" here instead of "heavier"?
The literal translation of zwaar is "heavy", but it is constantly used in Dutch to mean "hard", "tough", or "demanding" when talking about abstract situations, workloads, or conditions.

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