She has to work on weekends from time to time.怎样改成含有sometime

She has to work on weekends from time to time.怎样改成含有sometime She has been to Beijing .A.sometime B.some time C.some times from time to time nurses have to work night shifts from time to time My sister ( )goes to the movies on weekends but she sometime the young man has to work in his free time to carry on with What time does she e___ on weekends? ________ that she was very ill,she went to work on time. From time to time she looked round ( ) searching for someone 英译汉：from time to time he has the _____(able) to finish the work on time. ______ the work on time,a careful plan has to be made.