构成: ①.should / would do a. He said he would go to Shanghai for the holiday. b. He told me that I should succeed. ②.was / were going to do a. They were going to have a meeting. b. The students were going to plant some trees around the playground. ③.was / were to do a. We were to finish the work in three days. b. I was about to go out when a friend dropped in. 【查看更多】