was/were to do somethingXXused when talking about a time in the past to say what happened later 后来发生某事〔用于谈及过去某时间之后发生的事〕 This discovery was to have a major effect on the treatment of heart disease. 这一发现后来对心脏病的治疗产生了重大影响。
→ was/were to do something at be1(3)