Раскройте скобки, используя perfect progressive: 1.i (to live) in st.petersberg since 1990. 2.at last you have come. i (to wait) for half an hour. 3. he has been writing books since he was a yong man. he already (to write) eight books. 4. today she has been helping her mother since morning. they already (to wash) the floor and (to dust) the furniture. 5. this is the factory where my father works. he (to work) here for fifteen years.
