23. “all things considered” is a nominative absolute (NA).
24. “a nuclear engineer” is an appositive (AP).
25. “There” is an expletive (EXP), as you correctly noted.
26. “Maria” is used as a direct address (DA).
27. “green” is an objective complement (OC).
28. “president” is a predicate nominative (PN).
29. “alert” is a predicate adjective (PA).
30. “There” is, again, an expletive (EXP), as you again correctly noted.
31. “fence” is a direct object (DO).
32. “us” is an indirect object (IO).