The severity of his illness was so serious that even the doctor was surprised.

I forgot the password, so I can't log in.

I went shopping with my co-sister-in-law.

He cautioned not to speak ill of others, saying, 'Illness enters by the mouth, and disaster does not come out of it.'

What will you use this empty box for?

I go to school with my lunchbox every day.

I go to school with a lunchbox every day.

Where is my toolbox?

He opened the wooden box and checked its contents.

He heated the iron in the blacksmith's shop using a bellows.