Both "in" and "into" can be used when referring to placing milk in the fridge, but there are slight differences in their usage. 1. "Can you put the milk in the fridge?" 2. "Can you put the milk into the fridge?" Both sentences are grammatically correct and convey the same basic meaning. However, there is a subtle difference in the emphasis or nuance they carry. 1. "Can you put the milk in the fridge?" - In this sentence, the preposition "in" indicates the destination or location of the milk. 2. "Can you put the milk into the fridge?" - Here, the preposition "into" implies movement or direction towards the fridge. In essence, "in" suggests a static location or placement within the fridge, while "into" suggests a movement towards the fridge to place the milk inside. Both prepositions are commonly used and generally interchangeable in this context, so you can use either one based on your preference or regional variations in language usage.