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Key to Exercises 21-24

Exercises Unit 21 is done was done (passive 1)

UNIT 21
21.1
3  Glass is made from sand.
4  The windows are cleaned every two weeks.
5  This room isn’t used very much.
6  Are we allowed to park here?
7  How is this word pronounced?
9  The house was painted last month.
10  My phone was stolen a few days ago.
11  Three people were injured in the accident.
12  When was this bridge built?
13  I wasn’t woken up by the noise.
14  How were these windows broken?
15  Were you invited to Jon’s party last week?

21.2
2  Football is played in most …
3  Why was the letter sent to … ?
4  … where films are made.
5  Where were you born?
6  How many languages are spoken … ?
7  … but nothing was stolen.
8  When was the bicycle invented?

21.3
3  is made
4  were damaged
5  was given
6  are shown
7  were invited
8  was made
9  was stolen … was found

21.4
2  Sarah was born in Manchester.
3  Her parents were born in Ireland.
4  I was born in …
5  My mother was born in …

Exercises 22 is being done (passive 2)

UNIT 22
22.1
2  A bridge is being built.
3  The windows are being cleaned.
4  The grass is being cut.

22.2
3  The window has been broken.
4  The roof is being repaired.
5  The car has been damaged.
6  The houses are being knocked down.
7  The trees have been cut down.
8  They have been invited to a party.

22.3
3  has been repaired
4  was repaired
5  are made
6  were they built
7  Is the photocopier being used or Is anybody using the photocopier
8  are they called
9  were stolen
10  was damaged … hasn’t been repaired

Exercises Unit 23 be/have/do in present and past tenses

UNIT 23
23.1
3  are
4  Does
5  Do
6  Is
7  do
8  Is
9  does
10  Are

23.2
2  don’t
3  ‘m/ am not
4  isn’t
5  don’t
6  doesn’t
7  ‘m/am not
8  aren’t / ‘re not

23.3
2  Did
3  were
4  was
5  Has
6  did
7  were
8  Has
9  did
10  have

23.4
2  was
3  Have
4  are
5  were
6  ‘ve/have
7  is
8  was
9  has

23.5
3  eaten
4  enjoying
5  damaged
6  use
7  gone
8  understand
9  listening
10  pronounced
11  open

Exercises Unit 24 Regular and irregular verbs

UNIT 24
24.1
3  got
4  brought
5  paid
6  enjoyed
7  bought
8  sat
9  left
10 happened
11  heard
12  put
13  caught
14  watched
15  understood

24.2
2  began begun
3  ate eaten
4  drank drunk
5  drove driven
6  spoke spoken
7  wrote written
8  came come
9  knew known
10  took taken
11  went gone
12  gave given
13  threw thrown
14  forgot forgotten

24.3
3  slept
4  saw
5  rained
6  lo st … seen
7  stolen
8  went
9  finished
10  built
11 learnt/ learned
12  ridden
13  known
14  fell… hurt
15  ran … run

24.4
2  told
3  won
4  met
5  woken up
6  swam
7  thought
8  spoken
9  cost
10  driven
11  sold
12  flew

Key to Exercises 21-24