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be
done.(过去分词)
+
“被……”
This charity is called ORBIS.
More money is needed for the charity.
Local doctors are invited to learn new skills.
The plane is used as a flying hospital .
Most eye problems can be cured by modern medicine.
Passive voice
150 patients were operated on during his last visit.
Usages of passive voice
The action is more important than the person who performs the action.强调动作承受者而不是动作的执行者。
It is obvious who performs the action. 动作的执行者是泛指或者不言而喻的。
We do not know or do not need to know who performs the action.不知道动作的执行者是谁或委婉避谈动作的执行者。
1. The lives of the patients with eye problems are improved.
2. The thief was caught this morning.
3. The problem was talked about just now.
We can introduce who or what performs an action in passive voice using by. Put by and the performer after the verb. 如果需要指出动作的执行者，可用“by”引出。
◆Many blind people were helped by ORBIS doctors.
the football field , clean, every morning
The football field is cleaned every morning.
The sports meeting , hold , each term
The sports meeting is held each term .
all the flowers , water, twice a day
All the flowers are watered twice a day.
Passive voice in the simple present tense
sweep, the main road, two hours ago.
The main road was swept two hours ago.
eight posters , last year, put up