Ответ:

3. I have read Tolstoy stories in the park for two hours.

4. I have read three stories

5. Granny has knit in the living room since morning.

6. Look! She has knit a sweater for me.

7. My sister has skated since childhood.

8. She has taken part in many competition so far.

9. Helen has traveled round Europe for 3 weeks.

10. She has already visited 3 countries.

Объяснение:

Present Perfect

Have/has (already/just) V3/ed (yet)

Это задание на употребление Present Perfect (используется, когда важно подчеркнуть результат действия) и Present Perfect Continuous (используется, когда важна длительность действия)

3. I have been reading Tolstoy stories in the park for two hours.

4. I have read three stories .

5. Granny has been knitting in the living room since morning.

6. Look! She has knitted a sweater for me.

7. My sister has been skating since childhood.

8. She has taken part in many competition so far.

9. Helen has been travelling round Europe for 3 weeks.

10. She has already visited 3 countries.