Wah How to use "Did" for emphasis.

We usually use did in the past simple in the question and negative statement.

• Did you go to work yesterday?
• I didn't read a book.

We can also use did in the positive sentences to emphasize what we did.

• We did eat a lot. (We ate a lot)
• I was sure I did do the right thing. (I was sure I did the right thing.)
• Maria did spend a lot of money.
• It did snow a lot.
• Why is the door still open? I did lock it by myself!
• I am sure John did not like this website. No, you are wrong. He did like it in fact.
• Did you ask Mary to come to the party? Yes, I did ask her.

I have been thinking of him all time, I did like that guy so much.