3. 与将来事实相反： If 主语 + , 主语+ ____________________________ sth. 1.If I ________________ live long enough to have a job, I _______________ to be a doctor, helping these AIDS patients. (choose) 2.If there ____________ another flood, he ______________ his mistake. (realize)

did/were should do were to do

would /should/could/might do

were to/should

would choose

should be

might realize