I/ we/ you/ they had worked
he/ she/ it had worked
We had learned 5000 words by the end of last month.
I had finished the composition before supper.
When I woke up it had already stopped raining.
I hadn't learned any English before I came here.
常用於引導這類副詞子句的連接詞有：when當...的時候，as soon as一...就，
I wondered who had taken the umbrella without permission.
He told me that he had passed the exam.
I had intended to come over to see you last night, but someone called and I couldn't get away.
We had hoped to catch the early bus, but found it was gone.
If you had come yesterday, you would have met him.
She would have come if she hadn't been so busy.