1.a.Who knows French & German?
B.Does he know French & German?
C.Does he know French & German or English & Russian?
2.a.who speaks French very well?
B.does he speak French very well?
C.does he speak French very well or German?
3.a.who comes to his study?
B. does student come to his study?
C.does student come to his study or to his work?
4.a. Who swims in the sea every day?
B. does boy swim in the sea every day?
C. Does boy swim in the sea every day or in the swimming pool?
5.a.who usually plays football at the stadium?
B.do those boys usually play football at the stadium?
C. Do those boys usually play football at the stadium or in the street?
6.a.who is sitting by the fire?
B. does he sitting by the fire?
C. Does he sitting by the fire or no?
7.a.who can play tennis?
B. does Mike can play tennis?
C.does Mike can play tennis or volleyball?
8.a.what is on the desk?
B. is telephone on the desk?
C. Is telephone on the desk or on the table?
9.a.what stands on the desk?
B. is telephone stands on the desk?
C.is telephone stands on the desk or on the flore?
10.a.who always works at this desk?
B.does Mr Priestley always work at this desk?
C.does Mr Priestley always work at this desk or at that?