Usage Examples Present Perfect vs Past Simple

• I've known Sarah for five years. -
• I stayed home last night. -
• I haven't bought a new computer yet. -
• Have you ever been to Ukraine? -
• The teacher hasn't seen you this week. -
• Who is the smartest person you have ever met? -
• I didn't go to the university last week. -
• Have you ever met a celebrity? -
• John liked my new book. -
• Emily didn't see you yesterday. -
• They haven't lived here for years. -
• My sister was born in Italy. -
• My dad broke his leg last month. -
• What did your husband do last month? -
• I had pancakes for breakfast. -
• My brother has been to Mexico three times. -
• My mum has lost her keys and cannot get into the house now! -
• Has your mother done the shopping already? -
• Did we take this bus last time? -
• Did they go to the university with you? -