Should/Shouldn't Have
Must have/Must not have
Might have/Might not have
May have/May not have
Would have/Woudln't have
100

Katie bought a cup of coffee late at night. She couldn't sleep and regretted buying it.

Katie should not have bought a cup of coffee.

100

No one did their homework for Day 13. Give a reason why.

No one did their homework for Day 13, everyone must have been busy. 

100

From the look of the palm trees on Him Lam Street, it's possible there was lots of thundering and lightning last night. I'm not sure.

It might have been thundering and lightning last night. 

100
It's possible that Dieu didn't like the ring that Bao got her for her engagement.

Dieu may not have liked the ring she received from Bao. 

100

People _____ _____ _____ the party more if you had played less EDM music and more KPOP

People would have liked the party more

200

You did not revise for your English test and got a low score. You are sorry about this.

I should have revised for my English test.

200

When I saw Felix this morning, he was eating a Banh Mi in reception. He ______ ______ _______ breakfast.

He mustn't have eaten breakfast.

200

When Khang messaged his friend Duy, he didn't get a reply. It is thought that Duy's phone battery had died but it's not clear.

Duy's phone might have run out of battery.

200
Maybe some people still travelled to Vung Tau today.

Some people may have still gone to Vung Tau today.

200

The Trà đá _____ ____ _____ so cold if you had put the ice in for longer

The Trà đá wouldn't have been so cold if you had put the ice in for longer.

300
Instead of taking a GRAB car, Kate took a Vinasun taxi from Tan Son Nhat airport. The fare turned out to be much more expensive.

Kate should not have taken the Vinasun taxi. Kate should have used GRAB. 

300

Binh's Maths skills are phenomenal, he is a little genius but he ______ _____ a good Maths _______, __. 

he is a little genius but he must have a good Maths teacher, too.

300

Why did Hieu leave the Karaoke bar. Maybe he didn't feel well.

Hieu might have been feeling unwell.  
300

Maybe Duc didn't hear the cashier in Lottemart when she asked him for smaller money.

Duc may not have heard the cashier in Lottemart.

300

If Pham had done better in the last set, perhaps he _____ _____ _____ the match

Perhaps he would have won the match or perhaps he wouldn't have lost the match.

400

Khoa played PUBG when he was supposed to be doing his homework. He admitted he was wrong.

Khanh should not have played PUBG. Khanh should have done his homework.

400

Tran returned three out of the four t-shirts she bought from the BAD HABITS store. They _______ _____ ____ her very well.

They mustn't have fit her very well.

400

All the student's answers are wrong. Maybe they didn't understand the instructions on how to use modals.

They might not have understood the instructions. 

400

It's possible that the teacher has received everyone's homework on EDX.

The teacher may have received homework from everybody on EDX.

400

If the COVID-19 outbreak hadn't ever happened in the first place, people ______ _____ _______ to wear _____.  

People wouldn't have had to wear masks.

500

Diep went to CGV Cinema and bought TWO bags of popcorn for the movie. Later she felt sick.

Diep shouldn't have bought two bags of popcorn. 

500
This Jeopardy game is amazing! It ______ ____ ____ the teacher a long time to ______.

It must have taken the teacher a long time to make.

500

Why did the GoViet arrive so late? Maybe he didn't know where he was doing.

The GoViet driver might have got lost. 

500

Perhaps COVID19 was a reason that Diem wasn't able to go to Korea. 

Diem may not have been able to go to Korea due to COVID-19.

500

If you decided against drinking 2 bottles of STING before class today, you ______ _____ _____ any problems with your _____

If you decided against drinking 2 bottles of STING before class today, you wouldn't have had any problems with your concentration.

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