Not only did he promise to help us,but he also wanted to lend us some money.

问题描述:

Not only did he promise to help us,but he also wanted to lend us some money.
这句话可以变成Not only did he promise to help us,but also wanted to lend us some money或Not only did he promise to help us,but also want to lend us some money.

都不可以,因为后半句缺少主语.not only.but also..的句式:but also=but 是连词,后面+句子,一个完整的句子是不能缺少主语的可以这样说Not only did he promise to help us,but also he wanted to lend us some money...