Dataset abstract The dataset includes annotated spoken corpus data of N = 3685 utterances, created with a picture description task that elicited semi-spontaneous oral production data from N = 5 learners of Hindi at a Belgian institute. Following a longitudinal design, we gathered data during four observations. These found place in the second (Time1), third (Time2; Time3) and fourth semester (time4) of their Hindi course trajectory. The corpus data is annotated for (i) Learner, (ii) Time of elicitation, (iii) the use of -ko as a Differential Object Marker and (iv) -ko as another marker, as well as multiple features associated with ko-marking, including: (v) Specificity of the Direct Object, (vi) Animacy of the Direct Object, (vii) the (lemmatized) sentence verb, (viii) the (lemmatized) head of the Direct Object Noun Phrase, (ix) the (lemmatized) head of the Noun Phrase associated with other uses of -ko, and (x) the semantic role of these other uses of the ko-marker.