Исправить ошибки (в контексте предложения) в словах, которые обозначены скобками!
correct the mistakes printed in bold. explain your corrections.
1. we (will be waiting) here until he plugged in the laptop.
2. i forbid you to use the computer till you (have been) sixteen.
3 when sophia comes back next month, it (is) three years since she (was) away. 4.scientists (find) it difficult to cure many illnesses until the level of technology was improved.
5 she never uses her mobile when the battery (had been) low.
6 last week, sam (requires) a refund when he (discovers) that his 4 new digital camera (is) broken.
7 until you bought me a cellular, i (used) a land-line phone.
8 tomorrow tom (pay) the connection fee when he go to work.
