引用部分は、センテンス（文）として引用する場合は大文字で始めます。フレーズ（語句）として引用する場合は小文字で始めます。
センテンスとして引用する場合：
○ In his speech, he said, “We made a fatal mistake.”
× In his speech, he said, “we made a fatal mistake.”
フレーズとして引用する場合：
○ In his speech, he said that we had made a “fatal mistake.”
× In his speech, he said that we had made a “Fatal mistake.”
＊センテンスとして引用する場合でも、引用文の間に発言者などを挿入するときは、後半を小文字で始めます。
○ “Without your help,” the president said, “we would have failed.”
× “Without your help,” the president said, “We would have failed.”
