The document discusses different ways to express wishes and hypothetical situations using conditionals and the verbs "wish" and "if only". It outlines five categories:
1) Present states using "wish/if only" plus the past simple tense
2) Present actions using "wish/if only" plus "would"
3) Expressing irritation using "wish/if only" plus "would"
4) Present ability using "wish/if only" plus "could"
5) Wishes for the future or past situations using "wish/if only" plus "would" or the past perfect tense.