Questions & Answers about لازم است که کارگر به این خطر دقت کند.
Why do we use کند instead of میکند in this sentence?
Because of the phrase لازم است که (it is necessary that). Impersonal phrases showing necessity or possibility require the verb in the following clause to be in the present subjunctive mood. That is why the normal present tense میکند changes to the subjunctive کند.
Why does the preposition به come before این خطر?
The compound verb دقت کردن (to pay attention) requires the preposition به (to) when specifying what someone is paying attention to. In Farsi sentence structure, the preposition and its object (به این خطر) usually come right before the verb at the end of the sentence.
Why doesn't the subject کارگر (the worker) go at the very beginning of the entire sentence?
The phrase لازم است (it is necessary) is an impersonal phrase, meaning it functions as its own independent block of meaning without a specific person as the subject. The word که (that) connects it to the second block, where کارگر acts as the subject of the new action.
How is the subjunctive formed for دقت کند?
The infinitive is دقت کردن (to pay attention), which is a compound verb. To make it subjunctive, we only change the helper verb کردن. We take its present stem کن and add the third-person singular ending ـد to match the worker (کارگر), giving us . Notice that it does not take the usual subjunctive prefix because compound verbs with typically drop it.