Question

i poured ______ a sauce pan of milk . (fill in the blank with preposition )

Answer 1

i poured down a saucepan of milk.

Answer 2

The answer is I poured into a sauce pan of milk. Here the preposition in is used for explaining the event of flowing of a liquid from a container. Here the liquid is the milk and the container is the saucepan.

However, pour into is a phrasal verb and according to English dictionary, it means pour something into something, which exactly matches with the sentence.