The prepositional case plays an important role in English grammar.

Prefix notation is a notation where the operator comes before the operands.

Postfix notation is one method of expressing calculations.

This input device is very easy to use.

She was diagnosed with placenta previa.

The issue of the previa vessel is a very important issue in obstetrics.

He donated all of his property.

I am currently living in Tokyo.

You can feel his presence.

He was feeling guilt.