I'm one too, and I'm sure there are lots of night-owls in the IT world.

Certainly she wouldn't have dreamt that I would get up promptly without grumbling.

The blood on the road must be mine.

I must have lost it.

Something must have happened to him on the way.

It must be the postman.

The kettle must be boiling.

He must be at home as the light in on.

He must be a bookworm to read ten books every day.

My mother must be angry.

Her mother must have smelled something fishy.

When we take the wind-chill factor into account, the temperature must have been lower than thirty degrees below zero centigrade.

I must have caught a cold.

My father must have been handsome in his youth.

He must have been ill.

He must be tired.

She must have forgotten the promise.

She must be angry with me.

She must be sick.

She must have been very beautiful.