Nothing at all, of course, replied Poirot, smiling. 
Poirot said "not at all with" a smile.
Definitely, of course replied Poirot, with a smile.
a person is riding a bike down the street
At least 2 people are wearing shirts.
A nun walks by a groups of people outside a church.
People much younger than you are.
The teens are spray-painting the side of the building with graffiti.
A man in blue shorts preparing to dive into a pool.