1)вставь am, is, are.
My car...blue. People...very rude. I...a good pupil. You...doctors.
2) Вставь was или were.
These girls...students. This cat...there. He...a great scientist.​

My car is blue . People are very rude. I am a good pupil. You are doctor

These girls were students . This cat was there . He was a great scientist