1. Understanding the present perfect tense

• Basic structure: You should know that the present perfect is formed with the auxiliary verb "have" (or "has" for he/she/it) followed by the past participle of the main verb. 

Examples: 

"I have eaten."

"She has played."

2. Knowing past participles

• Familiarize yourself with the past participles of regular and irregular verbs. For example:

  • Regular: "play" → "played"

  • Irregular: "go" → "gone"        -         "be" → "been"

3. Present Perfect Tense

The present perfect is used to talk about actions that are relevant to the present or that occurred at an unspecified time in the past. The structure is:

+   Subject + have/has + past participle

-    Subject + haven´t/hasn´t + past participle

?   Have/Has + subject  + past participle  + ?

Examples:

+   I have eaten.

-    She hasn't finished her homework.

?   Have you traveled to Madrid?

4. Context of use

• Understand when to use the present perfect instead of other verb tenses, like the simple past. The present perfect is used for actions that are relevant to the present or that occurred at an unspecified time.

Usage of ever and never

• Ever

Used in questions to ask if something has happened "at any time" in life.

Example: "Have you ever traveled to London?"

• Never

Used in affirmative sentences to express that something has not happened "at no time".

• Example: "I have never eaten sushi."

Usage of ever and never

• Ever

Used in questions to ask if something has happened "at any time" in life.

Example: "Have you ever traveled to London?"

• Never

Used in affirmative sentences to express that something has not happened "at no time".

• Example: "I have never eaten sushi."

Examples in context

• Questions: "Have you ever seen a bear?"

• Negations: "I have never seen a bear."

• Usage of been: "They have been to the new museum."

• Usage of gone: "She has gone to the market."