【高一英语】有关neither的谓语动词
Afterthetalktheaudienceistobedividedintotwogroups.Ourgroupisfortheyoungwithnobodyolderthaneighteen.Theothergroupisfortheirparents.Bothgroupsaretodiscussthegenerationgap.Neither_____(is/are)surehowwelltheyunderstandeachother.Butneither______(does/do)theythinkthatitcannotberesolved.
请问为什么前一个空填is,后一个空却填do?