4 Read the Learn this! box. Complete the rules.
(Đọc phần Learn this! Hoàn thành các quy tắc.)
LEARN THIS! The passive
1 We form the passive with the verb 1 ____ and the 2 ____ of the main verb. The object of an active verb can become the 3 ____ of a passive verb.
They haven't found a cure for colds yet. (a cure = object)
→ A cure for colds hasn't been found yet. (a cure = subject)
2 If we need to mention the agent, we use 4 ____
Enormous public baths were built by the Romans.
3 We use the passive:
a when we do not know (or do not want or need to say) who does something.
b for more formal language, e.g. for processes.
First, the coffee beans are dried. Then they are roasted
c when we want to focus on the person to whom the action is done, not the person doing the action.
4 We use the 5 ____ and past continuous forms of the passive, but we do not use other continuous forms.
Hygiene is being improved.✔
→ Hygiene has been being improved. X
→ They have been improving hygiene.✓
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