The cat _______ (catch) two mice this week. The cat _______ (catch) a mouse last night.

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 completed. The Present Perfect is used for actions that occurred within a time frame that is not yet finished or has a connection to the present. Time phrases like 'last night' denote a completed past action (Past Simple), while 'this week' can be used with the Present Perfect if the week is not over and the action can be repeated or has present relevance.

Solution:

• The cat has caught two mice this week. (The week is not over, so this action is within an unfinished time period.)
• The cat caught a mouse last night. (A specific, completed time in the past.)

Answer: has caught, caught