Otherwise (adverb/conjunction)

otherwise can either be an adverb of manner or a conjuction.

otherwise as an adverb of manner usually comes after the verb:

• I must be eaten slowly. Eaten otherwise (= in a different way) it is not as good as eaten slowly.

otherwise as a conjunction  means "if not/or else":

• He must  be ill; otherwise he would go to the party.

or could also be used here in more colloquial English:

• He must be ill or (else) we would go to the party.