Present perfect

1. verb participle : have/has + verb 3

1.1. Irregular verb

1.1.1. Drink - Drank

1.1.2. Sit - Sit

1.1.3. Eat - Eaten

1.2. To be

1.2.1. Am - been

1.2.2. Are - been

1.2.3. Is - been

1.3. Regular verb

1.3.1. Study - Studied

1.3.2. Talk - Talked

1.3.3. Take - Takes

1.3.4. Enjoy - Enjoyeu

1.3.5. Live - Lived

2. The time expressions

2.1. Since

2.2. For

2.3. Already

2.4. -