Usage Examples Present Perfect vs Past Simple

• I haven't bought a new computer yet. -
• We went to Paris three months ago. -
• My mum has lost her keys and cannot get into the house now! -
• They haven't lived here for years. -
• I didn't go to the university last week. -
• I've known Sarah for five years. -
• Mary has not started her essay yet. -
• I stayed home last night. -
• I went to Spain last year to study Spanish. -
• Why did Anna go to Manchester two weeks ago? -
• My sister was born in Italy. -
• Did your mother go to a doctor on Tuesday? -
• Emily didn't see you yesterday. -
• It hasn't rained a lot this year. -
• My brother has been to Mexico three times. -
• I had pancakes for breakfast. -
• Have you ever been to Ukraine? -
• The teacher hasn't seen you this week. -
• Has Anna passed this exam already? -
• Jack has seen this film before. -