The phrase "are to" is often used to express obligation or expectation. However, there are various synonyms that can be used to convey the same meaning. "Must" is a stronger synonym that implies that something is a requirement. "Should" suggests a recommendation rather than a requirement. "Ought to" and "have to" both indicate a sense of duty or responsibility. "Need to" and "require" also express the necessity of doing something. "Are expected to" and "are obligated to" both convey a sense of responsibility or duty. By using these synonyms, one can add variety to their language without changing the fundamental meaning.