In English, we have the Active Voice and the Passive Voice (الفِعلُ لِلمَجهولِ). In Arabic, the concept is the same:
Refers to ordinary sentences with a known doer Khalid wrote the letter خالدٌ كَتَــبَ الرسالةَ
The sentence tells us what was done or what received the action, but the doer is unknown or unimportant. The letter was written كُتِــبَتْ الرسالةُ
The Passive Verb (الفِعْلُ لِلْمَجْهُول - The Unknown Doer) is formed differently for the past and present tenses:
شُرِبَ سُـمِــعَ رُفِـــعَ تُــقَــرِّبَ
يُــشْــرَبُيُــسْــمَــعُيُــرْفَــعُيُــتَــقَــرَّبُ
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