问题描述：
新概念英语第一册77课有哪些时态
NURSE:Good morning.Mr.Croft.
MR.CROFT:Good morning,nurse.I was to see the dentist,please.
NURSE:Do you have an appointment?
MR.CROFT:No,I don't.
NURSE:Is it urgent?
MR.CROFT:Yes,it is.It's very urgent.I feel awful.I have a terrible toothache.
NURSE:Can you come at 10 a.m.on Monday,April 24th?
MR.CROFT:I must see the dentist now,nurse.
NURSE:The dentist is very busy at the moment.Can you come at 2 p.m.
MR.CROFT:That's very late.Can the dentist see me now?
NURSE:I'm afraid that he can't,Mr.Croft.Can't you wait till this afternoon?
MR.CROFT:I can wait,but my toothache can't!
NURSE:Good morning.Mr.Croft.
MR.CROFT:Good morning,nurse.I was to see the dentist,please.
NURSE:Do you have an appointment?
MR.CROFT:No,I don't.
NURSE:Is it urgent?
MR.CROFT:Yes,it is.It's very urgent.I feel awful.I have a terrible toothache.
NURSE:Can you come at 10 a.m.on Monday,April 24th?
MR.CROFT:I must see the dentist now,nurse.
NURSE:The dentist is very busy at the moment.Can you come at 2 p.m.
MR.CROFT:That's very late.Can the dentist see me now?
NURSE:I'm afraid that he can't,Mr.Croft.Can't you wait till this afternoon?
MR.CROFT:I can wait,but my toothache can't!
问题解答：
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