If you say that you are ~, you are emphasizing that you are extremely tired. (INFORMAL)
By dusk we were ~ and heading for home.
ADJ: v-link ADJ emphasis
If you say that you are ~, you are emphasizing that you are extremely tired. (INFORMAL)
By dusk we were ~ and heading for home.
ADJ: v-link ADJ emphasis
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012