What is an example of periphrasis in grammar?

An example of periphrasis in grammar is forming the comparative and superlative degrees of adjectives by using periphrastic forms with “more + adjective” or “most + adjective,” instead of adding suffixes (like “-er” or “-est”).

Inflected form Periphrastic equivalent Inflected form Periphrastic equivalent
quicker more quick quickest most quick
stronger more strong strongest most strong
simple more simple simplest most simple