Modal verbs for evaluating

Question 1

You can use (…) to to express suggestions.
The government (…) increase taxes to fund education.

Answer 1

should/ought
should

Question 2

You can also use (…) to to express expectations.
The increased investment in education (…) help
improve standards.

Answer 2

should/ought
should

Question 3

You can use (…) to draw conclusions about the present.
The house (…) be very expensive. Look at the size of the
garden!

Answer 3

must
must

Question 4

You can use (…) to draw
conclusions about the past.
The paintings (…) cost a lot of money. (They are by
a famous artist and look very expensive.)

Answer 4

must/mustn’t have + past participle
must have

Question 5

You can use (…) to
make criticisms about the past.
The council (…) protected the building as it
was very important historically. (They were wrong not to
protect it.)

Answer 5

should/shouldn’t have + past participle
should have

Question 6

You can also use (…)
to make criticisms or show annoyance.
-They (…) protected the building! (It was worth
protecting, but they didn’t.)
-Private companies (…) at least (…) contributed to the
cost of the new building! (They didn’t contribute and I
think they should have!)

Answer 6

could have/might have + past participle
could have
might
have

Question 7

You can use (…) to express weak possibilities and
suggestions.
The coins we found (…) be worth a lot of money. (It is
possible, but I’m not sure.)
They (…) put works of art like sculptures to make the
city more attractive. (I’m not saying they should do it, but
it is a possibility.)
They (…) like to build a new art gallery to help
improve the area. (I’m suggesting this would be a good
idea.)

Answer 7

could/might
could
might
could/might