RULES 1 We use the present perfect to talk about experiences in the past / present which are important now / in the future. 2 We say / don't say exactly when a present perfect action happened. 3 We form the present perfect with have / be + past participle. 4 We often use the short forms: 've, 's.

Правила использования Present Perfect:

• 1. We use the present perfect to talk about experiences in the past which are important now.
• 2. We don't say exactly when a present perfect action happened.
• 3. We form the present perfect with have + past participle.
• 4. We often use the short forms: 've, 's.

Ответ: 1. now; 2. don't say; 3. have; 4. 've, 's.