The paper examines the assumption that the tendency of English to preserve the same subject in successive clauses will lead to the prevalence of thematic progressions with a constant theme defined by František Daneš in his conception of thematic progressions. This assumption is tested by analyzing two text sorts, academic prose and fiction. The term theme is used in two senses, as the least dynamic element in the functional sentence perspective, and as the textual topic being dealt with. The results confirm the prevalence of thematic progressions with a constant theme in both text sorts, the differences between them consisting in the complexity of syntactic structure and diversification of thematic progressions rather than in the quantitative representation of the registered progression types. While the academic text displays a simpler and clearer mode of development of the textual themes, the narrative text shows a more intermingled and bifurcated structure in this respect. On the other hand, the academic text is more complex syntactically. The most significant difference appears in the themes of thematic progressions with constant themes, which are invariably identical to the textual themes in fiction, but prevalently constituted by the general we in the academic text.