جَاءَ زَيْدٌ وَبَكْرًا
Zayd came with Bakr.
- جَاءَ is the action: came.
- زَيْدٌ is the doer: Zayd came.
- وَ means with, so it is waw al-ma'iyyah.
- بَكْرًا names the person who accompanied Zayd. It is mansub and functions as maf'ul ma'ahu.
Do not call بَكْرًا a second subject in this reading; its accusative ending marks a different role.