表示"本应该做某事却没有做"的英语结构是“should have done something but didn't do it”,其中should have done something表示“本应该做某事”,而didn't do it则表示“却没有做”。例如: I should have studied for the exam, but I didn't do it.(我本应该为考试学习,但我没有做。) He should ...