VERBS | ADVERB | PREPOSITIONVERBS➤be具有強制性▸➤become成為必須▸➤remain保持強制性▸➤make sth使⋯具有強制性◇The college authorities have now made these classes obligatory.學院管理部門現已將這些課程列為必修課。ADVERB➤almost, practically (especially BrE) 幾乎是必須的;實際上是必須履行的◇It's almost obligatory to have a blog nowadays.如今幾乎人人都得開博客。➤morally道義上必須履行的PREPOSITION➤for對⋯有約束力◇It is obligatory for vets to be registered.獸醫必須註冊。