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This work investigates the role of semantic clause types and modality in argumentative texts. We annotate argumentative microtexts with situation entity (SE) classes and additionally label the segments that contain modal verbs with their modal senses. We analyse the correlation both of SE classes and of modal verbs and senses with components of argument structures (such as premises and conclusions) and their functions (such as support and rebuttal). We find interesting tendencies in the correlations between both argument components and argumentative functions with SE types. We also see interesting differences in the distributions of modal verbs and senses within different argumentative components and functions, as well as evidence that modal senses can be helpful to distinguish conclusions and premises. We conclude that both semantic clause types and modal senses can be deployed for automatic recognition and fine-grained classification of argumentative text passages.