был чрезвычайно

was extremely

→ быть
phrase Rare #25,740
was extremely Used to emphasize an adjective or participle. The form of "быть" changes with tense and subject, so this exact wording is masculine singular past tense.
RU: Том был чрезвычайно умён.
EN: Tom was extremely smart.

Том был чрезвычайно умён.

Tom was extremely smart.

Том был чрезвычайно популярен среди девушек.

Tom was extremely popular with girls.