Question 11 and 12, dare to be passive voice. Thank you!

When judging the passive and active voices, you have to determine whether the subject is the originator or receiver of the action, or the relationship between the subject and the following sentence: the clothes are washedBetween the clothes and the back washing, it can be clearly known that the clothes are washed, which is a passive relationship, but as for who washed it, we don't know, although there is no by, but we still know that it uses the passive voice.

i washed the clothes.I do the laundry. The subject "I" is clearly the initiator of the action, hence the active voice here.

the classroom is book is read.In general, the passive voice is used for: 1 to express the been.

Suffer. Accept. Let.

Teachers are respectedTeachers are respected. 2. Emphasize the recipient of the action.

he is known far and wide .He is known far and wide. (He is known and understood) 3

It is not known or necessary to indicate the performer of the action. the room is cleaned every day.Generally speaking, whether to use the passive voice or not depends mainly on whether the relationship between the subject and the predicate is "do" or "be done".

Be verb + transitive verb past participle = passive voice.

Upstairs is not right. The past continuous tense should be was were+being+taughtThat's right.

3 d The outbreak of war does not need to be dynamic, it is only a past time, using the simple past tense.

9 c Games will be postponed, passive form only c correct.

11 b consider sth(to be) + adj, to be can be omitted.

The 12 c order command, followed by the subjunctive mood, should do, should can be omitted, and here passive, is printed.

15 c because by, so passive to be seen, happen to do accidentally, not passive, 17 b, according to yet, use the perfect tense, and the first empty has no obvious tense sign, both the perfect tense and the ordinary present tense.

18 b is seen.

29 d sth cost some money, no passive, the past perfect tense rarely appears alone, the past tense of cost is the archetype.

34 b The washing that has not yet taken place must be in the future tense, and the garment cannot be washed by itself, but it is washed.

38 c miss +doing form squirrel is lucky not to be caught, is passive, so with being caught

good luck

1.Previously, fire was used to keep warm.

once upon a time (fire was used to keep)warm.

2.These skirts were made of silk.

the dresses（are made of）silk。

3。In Australia, English is spoken.

english （is spoken）in australia。

4.It is necessary to call it composition immediately.

the composition（will be handed in）at once。

5.Is the homework done?

has the homework （been finished ）6.This couch is hard to the touch.

the sofa （feels hard）。

7.The story takes place at night.

the accident（took place at night）。