一般since引导的状语从句都是过去式，然后主句是现在完成时或者现在完成进行时如：So much has changed in the sport since I was a teenager.但有看到过是引导的句子是现在完成时的而非过去式Since you're finished the work, you may leave anyime1、...
Imagine our surprise when he walked into the room! 你想象一下，他走进房间时，我们多么惊奇！《牛津词典》我感觉是时间状语从句，但找不到被修饰成分，如果修饰imagine感觉逻辑不对，如果是修饰imagine our
surprise感觉和修饰imagine无什么...
They did the experiment as their chemistry teacher had instructed.这句话中的as引导方式状语从句，结尾能不能加them或to do，感觉这句话不完整，方式状语从句应该怎么用？Do it the way you were told. 这句话中结尾能不能加to do it？
Mr.Summers spoke frequently to the villagers about making a new box , but no one liked to upset even as much tradition as was represented bu the black box. 后半句 even 引导的状语从句语法有点看不太懂。