Ask three questions: (1) Are there two verbs? (2) Is there one later overt noun? (3) Does each verb seek that noun as its subject or object?
Example: «ضَرَبَنِي وَأَكْرَمَنِي زَيْدٌ». Both verbs require a subject, and only one overt «زَيْدٌ» appears after them.