I want present perfect tense in flash cards

Present Perfect Simple

The Present Perfect Simple tense connects the past with the present. It is used to describe an action or state that occurred at an indefinite time in the past or that began in the past and continues into the present.

1. Form

Positive Form:

• Subject + has/have + past participle
  • Examples:
  • I have studied for the exam.
  • She has visited Paris.
  • They have eaten lunch.

Negative Form:

• Subject + has/have + not + past participle
  • Examples:
  • I haven't studied for the exam.
  • She hasn't visited Paris.
  • They haven't eaten lunch.

Question Form:

• Has/Have + Subject + past participle?
  • Examples:
  • Have you studied for the exam?
  • Has she visited Paris?
  • Have they eaten lunch?

2. Uses

2.1. Actions completed at an unspecified time in the past (often with a result in the present):

• The exact time the action happened is not important or not known.
• Examples:
  • I have lost my keys. (The result is that I don't have them now).
  • She has finished her homework. (The result is that it's done now).

2.2. Experiences or achievements (often with 'ever' and 'never'):

• To talk about things that have happened at any point in a person's life up to now.
• Examples:
  • Have you ever travelled abroad?
  • I have never seen a chameleon before.
  • He has won several awards.

2.3. Actions that started in the past and continue up to the present (often with 'for' and 'since'):

• 'For' indicates a duration ($\text{for X years/months/days}$).
• 'Since' indicates a starting point ($\text{since 2010/Monday/I was a child}$).
• Examples:
  • They have lived here for ten years. (They still live here).
  • She has worked as a teacher since 2005. (She still works as a teacher).

2.4. Recent actions (often with 'just', 'already', 'yet'):

• 'Just' for very recent actions.
• 'Already' for actions that happened earlier than expected.
• 'Yet' for actions expected to happen, used in questions and negative sentences.
• Examples:
  • I have just finished my breakfast.
  • We have already seen that movie.
  • He hasn't arrived yet. (Has he arrived yet?)

3. Common Time Expressions

• For: followed by a period of time (e.g., for two hours, for many years).
• Since: followed by a point in time (e.g., since Monday, since 2012).
• Already: indicates something happened earlier than expected.
• Just: indicates something happened a very short time ago.
• Yet: used in negative sentences and questions, meaning 'up to now'.
• Ever: at any time (used in questions).
• Never: at no time.
• So far/Up to now: indicates something up to the present moment.
• Recently/Lately: indicates something happened not long ago.