She _______ (watch) a movie yesterday. She _______ (watch) three movies this week.

Key Concept: Past Simple vs. Present Perfect

The Past Simple is used for actions that happened at a specific time in the past and are now finished. The Present Perfect is used for actions that started in the past and continue to the present, or for actions in the past that have a result in the present. Time expressions like 'yesterday', 'last week', 'in 1999' usually indicate Past Simple. Time expressions like 'this week', 'recently', 'ever', 'never', 'already', 'yet' often indicate Present Perfect.

Solution:

• She watched a movie yesterday. (Specific time in the past)
• She has watched three movies this week. (Action within a time period that is not yet finished)

Answer: watched, has watched