[語法] (1)主語・目的語の数と一致する：They are bus drivers. / Don't call those students fools. (cf. Those boys are a real headache. あの少年たちは本当に頭痛の種だ). (2)captain, chairman, head, president, principal など団体の長を表す語は無冠詞が普通( →as^１ 【前】 1)： She is captain of the team. 彼女はチームのキャプテンだ / They elected Lincoln President of the United States. 彼らはリンカンを米国大統領に選んだ.