The document discusses various expressions used to indicate preferences and obligations in English:
1. "Prefer to" and "prefer doing" are used to express general preferences, while "would prefer to" refers to preferences in a particular situation.
2. "Would rather" with the infinitive is used similarly to "would prefer to" to express preferences.
3. "Had better" implies something is advisable and its negative form is "had better not."
4. "It's time" followed by the past tense verb implies it is present or future time for something, while criticizing delays.
5. Expressions like "It's no use," "There's no point