How to say it might have been or might not have been in Japanese | ～かもしれません（過去）

The video tutorial covers the use of 'may have' and 'might have' for expressing past speculation and possibility. It includes discussions about a sale at a department store, concerns about leaving a window open, and various practice exercises to reinforce the grammar concepts. The tutorial concludes with questions that require using 'might' to answer.

What might have happened to the window when you left the house?

How long do you think the sale lasted?

What could have been the reason for the lights being off in the conference room?

What could have been the reason for not locking your locker?

What do you think about the test results from yesterday?

What might have been the weather like in Japan last July?

How many hours do you think you studied Japanese last week?