Грамматика уровня Advanced. TBBT

Когда объясняешь грамматику уровня Advanced.

Sheldon: Is "placed" right?

Leonard: What do you mean?

Sheldon: Is "placed" the right tense for something that would have happened in the future of a past that was affected by something from the future?

Leonard: Had will have placed?

Sheldon: That's my boy.