1.I have danced (since/for) two hours.
2. She has read this book ( since / for) two o'clock.
3. We have done skiing (since / for) we were 8 years old.
4. He has swum professionally ( since/for ) 8 years.
Вставьте since /for в предложения ,,Present Perfect"
1.for
2.since
3.since
4.for
Объяснение: