what is the difference between "i wrote" and "i was writing"
The expression 'I wrote' is in simple past while 'I was writing' is in past continuous tense.
Past Indefinite is also known as Simple Past. Simple past tense is used for an action completed in the past. It might occur with or without adverbs of time. It is also used for past habits. Instances for the same are:
The steamer sailed yesterday.
They left school last year.