Question

Why do you insist _____ our returning back home? 1) at 2) in 3) on

Answer 1

The correct preposition to use in this context is "on."

"When insisting on someone's returning back home," we are emphasizing the importance or urgency of the action. The preposition "on" is followed by the gerund form of the verb "return," which is "returning."

For example, "Why do you insist on our returning back home?" implies that the person speaking believes it is essential or necessary for the group to go back home.

Using the preposition "on" indicates a strong insistence or a particular focus on the action of returning.