https://www.afarinesh.org/%da%af%d8%b1%d8%a7%d9%85%d8%b1-relative-clauses%d8%b1%d8%a7%db%8c%d8%aa%db%8c%d9%86%da%af-%d9%88-%d8%a7%d8%b3%d9%be%db%8c%da%a9%db%8c%d9%86%da%af/