PAST MODALS OF DEDUCTION

MUST HAVE

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.

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.

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.

COULDN'T HAVE

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.

300

Change the next sentence by using COULDN'T HAVE: I am sure that my best friend wasn't the one who stole my purse.

My best friend COULDN'T HAVE STOLEN my purse.

500

Change the next sentence by using COULDN'T HAVE: I am certain that it wasn't possible for Laura to pass the test without studying anything.

Laura COULDN'T HAVE PASSED the test without studying anything. "

MAY / MIGHT / COULD + HAVE

200

Change the next sentence by using MAY / MIGHT HAVE: There is a possibility that Shakespeare didn't die on his birthday.

Shakespeare MAY / MIGHT not HAVE DIED on his birthday.

300

Change the next sentence by using MAY HAVE BEEN: It is possible that Albert Einstein was born in Australia.

Albert Einstein MAY HAVE BEEN BORN in Australia.

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.

SHOULD/SHOULDN'T + HAVE

200

Change the sentence: He didn't pass his exam because he didn't study.

He should have studied for the exam.

300

Provide advice in the past:

"Chris had a car accident when going to his job. He was late to work and he wasn't using the seatbelt. Also, he was exceeding the speed limit".

Answers may vary.

500

Provide advice in the past:

"My little brother burned his hand when he touched the stove".

Answers may vary.