1.A: why has he hot his hand up?
B: he wants the teacher to ask him. He knows the answer
2. A: how do you prepare for exams?
B: i read my notes and then i write question for myself.
3. A: who is singing downstairs?
B: that's my sister. She's good,isn't she?
4. A: can i speak to the director?
B: No. he is speaking to someone