We use the Past Simple to =describe completed actions or events that occurred at a specific point in the past=. This tense often indicates =actions or events that happened and ended in the past, without any emphasis on their duration=.
Form: V2
For example: "She visited her grandmother last weekend." This sentence indicates a specific action that occurred and ended in the past, over the weekend.
Signal words: ="yesterday", "last night", "last week", "in 1999"= etc.
The Past Simple is used for completed actions or events that occurred at a specific point in the past, while the Past Continuous is used for actions that were ongoing or in progress at a specific moment or over a period of time in the past.