Question

You must ________be working working somewhere​

Answer 1

You must have to be working somewhere.

Explanation:

• Has, have, has, are helping verbs that are added before a noun.

• Have is used for the pronouns and plural nouns.

• Whereas Has is used for the third singular person.

• Had is used in the past tense to show the completeness of action.  

• "to" is added to show the necessity in the given sentence as it is the appropriate preposition for the sentence.

Answer 2

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you must have to be working somewhere.