We can regard a sentence as a mapping of a thought: corresponding to the whole–part relation of a thought and its parts we have, by and large, the same relation for the sentence and its parts. Things are different in the domain of reference. We cannot say that Sweden is a part of the capital of Sweden.The reference of the parts of a sentence are not parts of the reference of the sentence. However: The sense of a part of the sentence is part of the sense of the sentence.