According to Ruppel, verbs in Sanskrit express the same information as other Indo-European languages such as English. Sanskrit verbs describe an action or occurrence or state, its embedded morphology informs as to "who is doing it" (person or persons), "when it is done" (tense) and "how it is done" (mood, voice). The Indo-European languages differ in the detail. For example, the Sanskrit language attaches the affixes and ending to the verb root, while the English language adds small independent words before the verb. In Sanskrit, these elements co-exist within the word.