except to do释义为 盼望做......
except doing释义为 除了做.......
excpet作为介词用时,后面只能跟名词、动名词、名词短语和名词从句,用doing。做连词时用to do,当作连词时,后面接that从句,也有接不定式的:He wouldn't talk about work, except to say that he was busy。