* Formal: "Attending the company holiday party is obligatory for all employees."
* Informal: "We had the obligatory awkward family photo before dinner."
* With a negative connotation: "He felt obligated to give a speech, but it was obligatory and he wasn't really interested in doing so."
* Emphasis on duty: "As a citizen, it is obligatory to pay taxes."
* With a specific action: "The new law makes it obligatory to wear a helmet while riding a motorcycle."
Note: "Obligatory" often suggests a duty or requirement, but it can also imply something expected or traditional, even if not strictly required.