The present perfect tense can be used to talk about something that happened in the past, but has a connection to the present.

Positive: subject + have/has + past participle
Negative: subject + have/has + not + past participle
Question: Have/Has + subject + past participle?

Common uses:

1. To talk about an action that started in the past and continues up to the present

• I have lived in this city for five months.
• They have not been happy for years.
• Has she worked at the same company since graduating?

2. To talk about an action that happened at an unspecified time in the past

• He has visited Paris several times.
• I haven’t seen that movie before.
• Have they eaten there?

3. To talk about an action that was completed in the recent past and has a result in the present

• I have just finished my homework.
• She hasn’t eaten breakfast. (so she’s hungry now)
• Have they recently bought a house?