I bought some flowers yesterday. We celebrated Christmas last winter.Past Simple She was buying some new books from 3 till 4 yesterday. I was celebrating my birthday the whole day yesterday.Past ContinuousHe had bought a car by 3 o'clock. She hadn't celebrated this holiday by the evening. Past Perfect. We buy bread every day. They celebrate Easter every spring.Present SimpleI am buying a newspaper right now. What are you celebrating at the moment? Present ContinuousI have just bought a new dress. She has never celebrated it. Present PerfectHe will buy a car next year. I will celebrate New Year next winter.Future Simple He will be buying a new house at this time next month. We will be celebrating Thanksgiving Day this time next autumn.Future ContinuousYou will have bought a new book. He will have celebrated it.Future Perfect