This

Pronoun

  is

Auxiliary

  the

Determiner

  main

Adjective

  reason

Noun

  why

Adverb

  pesto

Noun

  recipes

Noun

  often

Adverb

  differ

Verb

  from

Adposition

  each other

.

This is the main reason why pesto recipes often differ from each other.

This is the main reason why pesto recipes often differ from each other.