He always seemed to be hiding something, always avoiding being seen.

He is using methods to avoid search engines so that his information does not get caught by them.

He is talking about something specialized that a commoner cannot understand.

His jokes always have a double entendre, which is interesting.

Double negatives are a common phenomenon in English grammar.

Would you like to go on a double date tonight?

He has a very passive personality.

Learning Modern English is important for smooth international communication.

The study of Middle English is very important for understanding the history of English.

Wasei-eigo is a unique way of expression in Japan.