Question

谁能帮我分析一下这句话里涉及到的语法和句型结构的用法？

"But it didn't take very long before they discovered that the most important thing was the ability to send mail around, which they had not anticipated at all,"

Answer 1

"But 是连词it是主语 didn't take 是谓语very long 是宾语before they discovered that the most important thing was the ability to send mail around是状语从句，其中that从句是状语从句中的宾语从句, which they had not anticipated at all是非限制性定语从句修饰前面的the ability,"
本句意思：但是没过多久，他们就发现最重要的事情是能够四处发送邮件，这完全出乎他们的意料。