Learn Farsi: تو پویشای خودجوش، مردم با همیاری به درختکاری ادامه میدن. - In grassroots campaigns, people continue tree planting with mutual assistance.

This is because of the compound verb edâme dâdan (to continue). In Farsi, you "give continuation to" an action. The structure is edâme dâdan be + Noun or Infinitive. Here, the action noun is derakht-kâri (tree planting), so we say be derakht-kâri edâme midan.

Why is "campaigns" written as puyeshâ instead of puyesh-hâ?

This sentence is written in a conversational register. In spoken Farsi, the plural suffix -hâ usually drops the "h" and becomes just -â. When we add the ezâfe to link it to the adjective, it sounds like puyesh-â-ye. You can also see this spoken style in the verb midan (instead of the formal midahand) and the word to (colloquial for "in").

How does the word khod-jush come to mean "grassroots" or "spontaneous"?

It is a great compound word! It combines khod (self) with jush (the present stem of jushidan, to boil or spring up). A khod-jush movement is one that "boils up by itself," meaning it is spontaneous or driven by regular people from the bottom up (grassroots), rather than organized from the top down.

How is the word derakht-kâri (tree planting) constructed?

It combines derakht (tree) with kâr (the present stem of , to plant) and the suffix , which turns it into a gerund or action noun. literally translates to "the act of tree planting," making it the perfect action noun to use with our target verb .