Wordde stofMeaningthe substancePart of speechnounPronunciationCourseDutchLessonDummy subject with infinitives (het is ... om te)Usages of de stofHet is onmogelijk om de stof te analyseren.It is impossible to analyze the substance.De wetenschapper had de stof geanalyseerd, want het is belangrijk om het effect te meten.The scientist had analyzed the substance, because it is important to measure the effect.