错误:He is wondering when can he finish this difficult job.
正确:He is wondering when he can finish this difficult job.
注意:宾语从句的否定转移
主句的谓语动词是think,believe,imagine,suppose,consider,expect,fancy,guess等,并且主句的主语是第一人称而且为一般现在时,从句的否定词一般要转移到主句上来,其反义疑问句一般与宾语从句一致。例如:I don't think he will come to my party.而不能说成I think he won't come to my party.