1. He a new car last month, but he doesn't really like it. (Correct)(Incorrect)
He bought a new car last month, but he doesn't really like it. (Correct)
2. I burned my finger while I breakfast. (Correct)(Incorrect)
I burned my finger while I was cooking breakfast. (Correct)
3. By the time I came back, Mike and Jane , so I couldn't tell them about it. (Correct)(Incorrect)
By the time I came back, Mike and Jane had already left , so I couldn't tell them about it. (Correct)
4. He for twenty years when he finally quit smoking. (Correct)(Incorrect)
He had been smoking for twenty years when he finally quit smoking. (Correct)
5. I you yesterday because my telephone was out of order. (Correct)(Incorrect)
I didn't call you yesterday because my telephone was out of order. (Correct)
6. He was waiting for his bus at the bus stop when the robbers him. (Correct)(Incorrect)
He was waiting for his bus at the bus stop when the robbers attacked him. (Correct)
7. I wanted to ask my son for help, but I saw that he , and I decided not to wake him up. (Correct)(Incorrect)
I wanted to ask my son for help, but I saw that he was sleeping , and I decided not to wake him up. (Correct)
8. Yesterday I went to an interesting museum that I before. (Correct)(Incorrect)
Yesterday I went to an interesting museum that I hadn't visited before. (Correct)
9. By the time we arrived, she for us at the train station for three hours. (Correct)(Incorrect)
By the time we arrived, she had been waiting for us at the train station for three hours. (Correct)
10. Christopher Columbus America in 1492. (Correct)(Incorrect)
Christopher Columbus discovered America in 1492. (Correct)