[語法]この「主張の根拠」を示す because は, for と同じく, 次の位置には生じない：^×B〜 [^×For] he fell off the pier, he was drunk. / ^×It was 〜 [for] he fell off the pier that he was drunk. / ^×Was he drunk 〜 [for] he fell off the pier? ( →for^１ 【接】)