~に違いない (must be)

She must not have been expecting me to get up clean and easy without whining about it.

Something must have happened to him on the way here.

Reading 10 books a day — he must be a bookworm.

She must be angry at me.

She was in a bad mood. Something must have happened before I arrived to set her off.

She must have been studying hard.

She must have caught the wrong bus.

She must have realized she had cancer.

I'm one myself, but there must be a lot of night owls in the IT industry.

After the federal congress passed that bill, there's no doubt that even more national flags were burned than before.

I must have dropped it.

That must be the mailman.

The kettle must be boiling.

The light's on, so he must be home.

My mother must have sensed something suspicious.

My father must have been handsome when he was young.

She must be from the south.

She must have been doing well financially back then.

She must have been beautiful when she was young.

She must surely have been a beauty when she was young.

She must have finished her work yesterday.

She must have been feeling unwell.

She must have been rich.

She must be very busy.

She must have worked very diligently.

She must have done it yesterday.

She must have completely forgotten about that promise.

She must have visited England last summer.

She'll definitely visit England this summer.

My mother must be angry.