Questions & Answers about ما خیلی عرق کردیم و الان به وان نیاز داریم.
This lesson is about experiencer verbs like نیازمان است (we need). Why does this sentence use نیاز داریم instead?
نیاز داشتن (to have a need) is a standard compound verb that conjugates normally to match the subject (ما ... داریم). You could absolutely replace it with the lesson's experiencer structure and say به وان نیازمونه (or formal نیازمان است). Both mean "we need a bathtub," and it is highly useful to recognize both forms!
Why is there a به (to) right before وان (bathtub)?
In English, you just "need a bathtub," but the Farsi verb نیاز داشتن requires the preposition به. You are literally saying "we have a need to a bathtub." Whenever you state what you need using this verb, you must introduce the needed item with به.
Is عرق کردیم (we sweated) an experiencer verb too?
No, عرق کردن (to sweat) is a standard compound verb made of عرق (sweat) and کردن (to do). It behaves like a regular action verb, which is why it takes the normal first-person plural ending (ـیم) to match ما (we), rather than using the attached pronoun suffixes like the psychological verbs in this lesson do.
Why doesn't وان (bathtub) take the definite object marker را?
First, it is an indefinite, general object in this context—they need "a bathtub," not one specific, previously mentioned bathtub. Second, acts as the object of the preposition , and words linked by prepositions never take the direct object marker .