I have always heard in conversation - that must be him / her on the phone. Of course we say:He is on the phone now. Grammatically, "that must be him" it is not strictly correct, since the case of a pronoun after "be" is nominative. However, in this case (must be ***), we...
ESL General English Grammar Questions
by
AlpheccaStars
15 days ago
Articles, Grammar, Verbs, Conversations, Prepositions, Clauses, Nouns, Pronouns, Commas, Subjunctives, Nominative