. 2. a) I sometimes (to cook) vegetables ad for dinner. b) I (to cook) meat soup for dinner now, c) I (to cook) fish soup for dinner yes terday afternoon. 3.a) My sister (to play) the piano once : day. b) My sister (to play) the piano now. c) My sister (to play) the piano twice yesterday. 4. a) We often (to go home by car from work. b) We (to go home by car from work now. c) We (to go) home by car from work yesterday evening. 5. a) Margaret (not to write) letters to her friends every week. b) Margaret (not to write) a letter to her friend now. c) Margaret (not to write) a letter to her friend last Monday. 6. a) The plane usually (to leave) Moscow for London at 12 o'clock. b) The plane (to leave) Moscow for Lon- don now. c) The plane (to leave) Moscow for Lon- don yesterday evening​