Purpose Clauses: damit vs. um...zu

Same subject vs. different subject decides the tool

Telugu's purpose construction — a nominalized verb (ending in -డం) followed by కోసం ('for the sake of') — doesn't split by 'same subject vs. different subject' the way German does; the same pattern covers both sentences above. German requires um...zu only when the subject of the purpose and the subject of the main clause are identical; the moment a second, different person is involved (du in the example), um...zu becomes ungrammatical and damit takes over, opening its own subordinate clause with its own subject and a verb pushed to the end. Before choosing between them, always ask: is the 'purpose' person the same as the main subject, or someone else?