Subject + verb in the past form + object.
Subject + the past form of “to be” (was/were) + verb + ing + object.
I was trying to fix the car this morning,
Subject + had + been + verb + ing + object.
She said she had been working in a hospital when World War II started, and she worked there for many more years.
They thought the experiment would prove their theory.
I had gone home; then I read a book and fell asleep.
Subject+ had + past form of a verb + object.
