We use the past simple when an action or situation happens and finishes in the past. We usually say or know when it happened. She called me at the office yesterday. I worked in London in 2010.

Often, in language use, deciding whether to use the present perfect or the past simple depends on your perspective on the event. Two people were killed when the bomb went off but the effect of ...

English grammar is the foundation of effective communication ... By mastering these fundamental principles, you'll be able to ...