1.They played tennis last week. (play-played-played - играть)
2. I have never played tennis before.
3. The satelite landed in the sea two hours ago. (land - landed - landed -приземляться, высаживаться, сесть, пристать к берегу и т.д.)
4. We have changed our plan.(change - changed - changed - переменять, изменить и т.д.)