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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
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
Answers & Comments
Verified answer
1 We had been waiting here until he plugged in the laptop. (we need Past Perfect to show the earlier action)
2 I forbid you to use the computer till you are sixteen. (we use Present Simple in time clauses that refer to future time)
3 When Sophia comes back next month, it will have been three years since she is away. (we use Future Perfect in the main clause to talk about an action that will finish before a certain point in the future)
4 Scientists had found it difficult to cure many illnesses until the level of technology was improved. (we use Past Perfect to show the earlier action)
5 She never uses her mobile when the battery is low. (we use Present Simple to describe a habit, a regular action)
6 Last week, Sam required a refund when he discovered that his new digital camera was broken. (we use Past Simple to talk about things that happened in the past)
7 Until you bought me a cellular, I had used a land-line phone. (we use Past Perfect for the action that took place first)
8 Tomorrow Tom will pay the connection fee when he goes to work. (we use Future Simple in the main clause - because it refers to the future -and Present Simple in the time clause)