①当宾语从句的主语和主句的主语相同,且主句的谓语动词是hope,wish,decide,agree,choose等时,从句可简化为不定式结构。
I hope that I can receive your e-mail.=I hope to receive your e-mail.我希望能收到你的电子邮件。
②当宾语从句的主语和主句的主语相同,且主句的谓语动词是know,remember,forget,learn等时,从句可简化为“疑问词+不定式”结构。
She doesn’t know what she should do next.=She doesn’t know what to do next.她不知道下一步该做什么。
③当主句的谓语动词是ask,tell,show,teach等,且宾语从句的主语和主句的间接宾语一致时,从句可简化为“疑问词+不定式”结构。
Will you please show me how I can work it out?=Will you please show me how to work it out?请你告诉我怎样把它解出来好吗?
I don’t believe what Tom said.=I don’t believe Tom’s words.我不相信汤姆的话。