1. زَيْدٌ مُنْطَلِقٌ وَعَمْرٌو
Supply «وَعَمْرٌو مُنْطَلِقٌ». The second subject is nominative and its predicate omitted because the first predicate is an adequate clue.
2. خَرَجْتُ فَإِذَا زَيْدٌ
A predicate such as «حَاضِرٌ», or a locative expression when justified, is understood. The suddenness particle does not fix a precise location.
3. لَيَقُولُنَّ اللَّهُ
After a question about creating, supply «خَلَقَهُمَا اللَّهُ». «اللَّهُ» is the agent of an omitted verb, not just a name with an unspecified predicate.
4. قُلْ يُحْيِيهَا الَّذِي أَنْشَأَهَا
«يُحْيِيهَا» is an expressed verbal predicate that directly answers denial of resurrection and supports the argument.
A complete analysis identifies the case of the overt element, specifies the grammatical place of what is omitted, and explains why expression or omission serves this particular situation.