Present Deduction
MUST HAVE
COULDN'T HAVE
MAY / MIGHT / COULD + HAVE
NEGATIVE PREFIXES
100

Which modal verbs do we use when we aren't sure about something? And when we are sure?

might - may - could  

can't - must

100
Change the next sentence by using MUST HAVE: It is very likely that Walt Disney won more Oscars than any other entertainment.
Walt Disney MUST HAVE WON more Oscars than any other entertainment.
100
Change the next sentence by using COULDN'T HAVE: US astronauts almost certainly didn't see the Great Wall of China from the moon.
US astronauts COULDN'T HAVE SEEN the Great Wall of China from the moon.
100
BONUS :-)
100

What's the negative form of: expect

unexpected

200

They are on a trip to England. Their house ____ be empty.

must

200
Change the next sentence by using MUST HAVE: Picasso most probably produced more than 5,000 paintings in his lifetime.
Picasso MUST HAVE PRODUCED more than 5,000 paintings in his lifetime.
200
Change the next sentence by using COULDN'T HAVE: It is very likely that Mozart wasn't very well known when he died.
Mozart COULDN'T HAVE BEEN very well KNOWN when he died.
200
Change the next sentence by using MAY / MIGHT HAVE: There is a possibility Shakespeare didn't die on his birthday.
Shakespeare MAY / MIGHT not HAVE DIED on his birthday.
200

What's the negative form of: possible

impossible

300

I ____ go to the cinema this afternoon. I don't know yet.

might / may / could

300
BONUS :-)
300
Change the next sentence by using COULDN'T HAVE: I am sure it wasn't possible for my best friend steal my purse.
My best friend COULDN'T HAVE STOLEN my purse.
300
Change the next sentence by using MAY HAVE BEEN: It is possible that Albert Einstain was born in Australia.
Albert Einstain MAY HAVE BEEN BORN in Australia.
300

What's the negative form of: logical

illogical

400

Put the words in the correct order: can't / exam / studied / this / a lot! / be / his / he

This can't be his exam. He studied a lot!

400
Change the next sentence by using MUST HAVE: It is very likely that Johnn Travolta participated in more than ten movies.
John Travolta MUST HAVE participated in more than ten movies.
400
BONUS :-) Congratulations!
400
Change the next sentence by using MAY / MIGHT / COULD HAVE: There is a possibility that Leonardo da Vinci had an affair with Mona Lisa.
Leonardo da Vinci MAY / MIGHT / COULD HAVE had an affair with Mona Lisa.
400

What's the negative form of: rational

irrational

500

Correct the following sentence: They mustn't be at university. I've seen them at the supermarket.

They can't be at university. I've seen them at the supermarket

500
Change the next sentence by using MUST HAVE: I am almost certain it was my mom who bought the tickets for me.
My mom MUST HAVE BOUGHT the tickets for me.
500
Change the next sentence by using COULDN'T HAVE: Laura is sure it wasn't possible to pass the test without studying anything.
Laura COULDN'T HAVE PASSED the test without studying anything. "
500
Change the next sentence by using MAY / MIGHT / COULD HAVE: Charles is uncertain about going to the party or not.
Charles MAY / MITGHT / COULD go to the party.
500

What's the negative form of: famous

infamous

M
e
n
u