Which word in the sentence 'I've got to look for it' expresses obligation?

• A. Got
• B. To
• C. Look
• D. It

Answer: (A)

Obligation is shown by the phrase have got to, a common way to say you must do something. In I’ve got to look for it, the word carrying that sense is got, because it’s the part of have got to that signals necessity. The infinitive form to look is simply the action you must perform; to marks the infinitive, look is the verb, and it is what you’re going to do.