一

二

6.She told him he ought not do it.   7.I promised that I should do my best.   8.What will I get for dinner?   9.Your mother was really worried about you.You wouldn’t have left home without a word.   答案:1.can→could/might/may　2.didn’t→haven’t　3.may→must　4.mustn’t→needn’t　5.could→can　6.not后加to　7.should→would　8.will→shall　9.wouldn’t→shouldn’t