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A more complicated task suggests that you know the difference in meaning
between the phrases:
Darwin speculated that some birds might have this ability, but it’s amazing
to have proved it.
Darwin speculated that some birds might have this ability, but it’s amazing
to have it proved.
If you haven’t got a slightest idea about the difference, it will be easy enough to
remember that the first phrase suggests that we proved it ourselves. (The action
is performed by us). As for the second phrase, it stresses the fact that we’re
causing someone else to perform a service for us.
To practise what you have just learned you should supply the right forms of the
verbs in brackets using suitable forms of “have” where necessary.
a) They claim that they (test it) by experts.
b) I was curious about this new car and I was invited (test it) myself.
c) If you want to get a job done properly, it’s best (do it) yourself.
d) We couldn’t possibly tackle this job ourselves, so we (do it) by a local
firm.
e) She shows such talent for swimming that her father (train her) by
professionals.
f) Surely you (explain the process) to you before?
g) I don’t think you’ve quite understood. I’ll just (explain the process) to you
again.
h) When (repair the car) last time?
i) I don’t believe you (wall-paper the room) on your own. Earlier you always
( do it) by hand workers.
j) How wonderful to (tidy up the room) by the time of your arrival from a
long business trip!
The next exercise can be regarded as continuation of the previous one, but the
task will be to respond to the statements beginning with the words in brackets.
a) My hair really needs cutting. (Why don’t)
b) I thought no one would repair your car. (I finally)
c) Surely his book’s unpublishable! (No, he)
d) This lock needs fixing. (Why don’t)
e) My will needs changing. (Yes, you should )
f) This car needs servicing. (Yes, I must)
Respond to these statements beginning in the affirmative and replacing active by
passive.
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