36. The boy didn’t stop playing computer game until his father came home.
It was not until the boy's father came home that he stop playing computer game.
It is/ was not until + cụm thời gian + that mệnh đề: mãi cho đến khi... thì...
37. We didn’t go to bed until midnight.
It was not until midnight that we go to bed.
38. He didn’t hurry, so he missed the train.
If he had hurried, he wouldn't have missed the train. ( câu đk loại 3 )
39. We invited two hundred people to the wedding.
Two hundred people were invited to the wedding. ( câu bị động thì quá khứ đơn )
40. Lan buys some stamp at the post office. She wants to send letters to her friends.
To send letters to friends, Lan buys some stamp at the post office. ( to V : để làm gì )