Weought to obeyour parents. Here the underlined word 'ought to obey' is a/an -

- ought to obey হচ্ছে Verb phrase.

• We ought to obey our parents.
- উপরের sentence- এ "ought to obey" Verb phrase কারণ তা একটি Auxiliary verb 'ought to' এবং একটি Principle Verb 'obey' সমন্বয়ে গঠিত হয়েছে।

Source: Advanced Learner's English Grammar & Composition by Chowdhury & Hossain.