Answer:
The answer is "We did tell you how to find our house."
Step-by-step explanation:
The past emphatic has a slightly different structure than what we normally use. Instead of simply using the past form of a verb to affirm something, we employ the past form of the verb do (did) and the base form of the main verb. The past emphatic, as the name suggests, is used when we wish to give more emphasis to what is being said. It commonly shows up in arguments, or when one person is correcting what the other said. Compare the following dialogs:
"You never told me how to find your house. I needed a GPS to arrive here."
"We told you how to find our house. You probably forgot about it."
X
"You never told me how to find your house. I needed a GPS to arrive here."
"We did tell you how to find our house. You probably forgot about it."
In the first dialog, even though the second speaker is correcting the first one, there isn't much emphasis on the correction. We don't get the feeling that the second speaker is trying very hard to prove his point. In the second dialog, however, because the second speaker uses the past emphatic, we can sense he is annoyed by what the first speaker said. It's as if the second speaker wants to make it very clear that he did tell the location of his house, and there should be no doubt about it.