Positive/Affirmative: (add –ed or –d to the base form)
Negative: (add did not or didn’t before the base form)
Question: (add did plus subject before the base form)
When I say base form, it means the present form of the verb. For example: work is in present and worked is the past simple. We normally use past simple to talk about a completed event or activity. The action started and was completed.
Let us study the following examples:
Albert Einstein was a German scientist. He lived from 1879 to 1955. He developed the general theory of relativity, one of the two pillars of modern physics. He was only 76 years old when he died. (Lived/developed/was/died are all in past simple)
Very often the past simple ends in -ed (regular verbs)
- I work in a travel agency now. Before that I worked in a department store.
- We invited my classmates to our party, but they decided not to come.
- The police stopped me on my way home last night.
- Jenni passed her exam because she studied very hard.