Past modals of deduction

Front

What could have caused everyone to have a terrible stomachache the day after the wedding?

Back

It may have been the food.

Front

Why didn't the antibiotics work?

Back

His body may have become resistant to antibiotics.

Front

What is the correct inference about the cause of the E. Coli outbreak at school? Options: It may have been the poor hygiene standards., It must have been the poor hygiene standards., It must have the poor hygiene standards.

Back

It must have been the poor hygiene standards.

Front

What was the reason for the sudden spike in flu cases at the office?

Back

It must have been due to the lack of vaccinations.

Front

The food at the restaurant was undercooked. This __________ the reason for the food poisoning. Options: could have been, may not have been, must be

Back

could have been

Front

The recent outbreak of food poisoning was alarming. This __________ the reason for the emergency meeting.

Back

must have been

Front

Why were many students absent from class last week?

Back

It must have been due to the flu.

Front

Several employees reported feeling unwell after the company picnic. What is the most likely reason?

Back

It must have been due to the food served.

Front

What might have caused headaches after the concert?

Back

It may have been the loud music.

Front

After the party, many guests reported feeling ill. This __________ the reason for the health warnings.

Back

could have been