He kept talking with an impertinent attitude.

I can't stand his impertinence.

On sleepless nights, I sometimes take a soporific.

I forgot to take the laxative.

When I catch a cold, I often take a sudorific.

I think he is the right person for the job.

He committed a crime.

Functional analysis is a branch of mathematics that studies the properties of functions in infinite-dimensional spaces.

Let's talk about this case in detail later.

Ken is my best friend.