Learn Farsi: لطفاً پرده‌های سوخته را جمع کنید و داخل سطل بگذارید. - Please gather the burned curtains and put them inside the bin.

سوخته is a past participle. As you are learning in this lesson, it is formed by taking the past stem of the verb سوختن (to burn), which is سوخت, and adding ـه (-e). In Farsi, past participles are frequently used as adjectives, so سوخته translates perfectly to the English adjective burned.

Why does the object marker را come after سوخته instead of right after the noun پرده‌های?

The definite direct object marker را always goes at the very end of the entire noun phrase. Since the curtains and the adjective burned are connected by an ezafe (پرده‌هایِ سوخته), they form a single block. The را must wait until after the adjective to show that the whole phrase is what you are gathering.

Why do the verbs جمع کنید and بگذارید both end in ـید?

Both verbs are giving a polite command to the listener: gather and put. They use the plural you ending ـید (-id) to be formal and polite. Notice that بگذارید gets the standard command prefix بـ (be-), while the compound verb جمع کنید simply uses the present stem of کردن without a prefix.

What is the symbol at the end of the word لطفاً?

The two little diagonal lines over the alef at the end of لطفاً (lotfan) are an Arabic spelling feature called tanvin. In Farsi, it is pronounced as an and is used to turn a noun like (favor) into an adverb like (kindly or please).