If you want to make a past emphatic tense, you need to use the verb DID + the present form of that particular verb. Assuming that the verb you need is TELL, the correct answer here would be did tell.
We did tell you how to find our house.
a. Where was Sarah yesterday?
b. Where were you yesterday?
c. What is your favorite subject?
d. Why was your mum mad?
e. How many students were in school yesterday?
f. What was the cost?
g. Was it cold last month?
h. How old was your grandpa when he went to war
i. Who was in Bucharest for two weeks?
j. How long was the trip?
k. Who were your neighbors for fifteen years?
Answer:
- formal tone
- use of the third-person rather than first-person perspective (usually)
- a clear focus on the research problem under investigation, and precise word choice
Explanation: