Елизавета7 лет назад
I wrote a letter to my friend yesterday.
This sentence is in Past Indefinite. Past Indefinite is formed with the help of the suffix – ed. We add this suffix to verbs when they are regular. (To watch — watched). When verbs are irregular we use their second forms. To write is an irregular verb. The second form of to write is wrote. The keywords of Past Indefinite are yesterday, ago, last year. Negative and interrogative are formed with the help of the second form of the auxiliary verb to do — did.
Negative — did + not + verb.
I did not write a letter to my friend yesterday.
Interrogative — did + subject + verb.
Did I write a letter to my friend yesterday?