Do

To perform an action, task, or activity. It can also be used as a helper verb in questions and negatives, like in 'Do you know?' or 'I do not understand.'

From Old English 'dōn', meaning 'to perform, make, act'. It is related to German 'tun' and Dutch 'doen', showing a shared Germanic root. Over centuries, 'do' also took on a grammatical role as a helper verb in English.