The IO (or “indirect object”) will be found between the verb and its object. The IO can be found by asking “to whom” or “for whom”.
Jeb built Joe a house.
Here are the questions to ask:
- The verb is “built”. Who is doing the building? Jeb is doing the building. Therefore, “Jeb” is the subject.
- Jeb built what? Jeb built a house. Hence, “house” is the DO.
- Jeb built the house “for whom”? For “Joe”, so “Joe” is the IO.
An IO will be in the dative case. (BBG 7.6)