1 We will be waiting here until he plugged in the laptop.
2 I forbid you to 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 fi n d it diffi cult 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
nvenient as nowadays until the Internet ... (invent).
2) Correct the mistakes printed in bold. Explain your corrections.
1
1 We will be waiting here until he plugs in the laptop. (we use Present Simple in time clauses that refer to future time)
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 be three years since she
was away. (we use Future Simple in the main clause as it refers to future time)
4 Scientists find it difficult to cure many illnesses until the level of
technology is improved. (we use Present Simple in time clauses that refer to future time)
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)
