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Create the sentence
MAY / MIGHT / COULD + HAVE
Find the mistake
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

Change the next sentence by using MAY / MIGHT HAVE:  I might I bought the wrong brand. Can you please ask Mom to check?

I MAY / MIGHT HAVE bought the wrong brand. Can you please ask Mom to check?

100

He might has forgotten about the meeting.

He might have forgotten about the meeting.

200

Change the next sentence by using MUST HAVE: Picasso 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

They should have not forgot to send the report.

They should not have forgotten to send the report.

300

Change the next sentence by using MUST HAVE:
He is so late. He was probably stuck in traffic.

He is so late. He must have gotten stuck in traffic.

300

Change the next sentence by using COULDN'T HAVE: I am sure it wasn't possible for my best friend to 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

I would have tell you the truth if I wasn’t afraid.

I would have told you the truth if I weren’t afraid.

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

Change the next sentence by using COULDN'T HAVE: I thought I saw Adam this morning but it's impossible – he's in Greece this week.

I thought I saw Adam this morning but it couldn't have been him – he's in Greece this week.

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

If I studied harder, I must have passed the exam.

If I had studied harder, I would have passed the exam.

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 MIGHT / COULD have gone to the party.

500

They might not have understood what you mean.

They might not have understood what you meant.