Statement:
All desks are chairs.
All chairs are tables.
All tables are boxes.
All boxes are trunks
Conclusions:
I. Some trunks are tables.
II. All chairs are boxes.
III. Some boxes are desks.
IV. All desks are trunks.

All tables are boxes + All boxes are trunks = A + A = A = All tables are ? trunks ? conversion Some trunks are tables (I) Hence I follows. All chairs are tables + All tables are boxes = A + A = A = All chairs are boxes Hence II follows. All desks are chairs + All chairs are boxes = A + A = A = All desks are boxes ? conversion ? some boxes are desks (I) Hence III follows. All desks are boxes + All boxes are trunks = A + A = A = All desks are trunks Hence IV follows.