Keep the verb singular before an explicit deputy subject.
● يُفْتَحُ الْبَابُ — The door is opened.
● تُقْرَأُ الرِّسَالَةُ — The letter is read.
● يُعْرَفُ الْمُجْرِمُونَ — The criminals are recognized.
The verb is singular because the explicit deputy subject follows it. Its initial prefix still agrees with masculine or feminine gender: يُـ with a masculine noun and تُـ with a feminine noun.