Breakdown of Wo seid ihr umgestiegen?
sein
to be
ihr
you (informal plural)
wo
where
umsteigen
to change trains
Questions & Answers about Wo seid ihr umgestiegen?
How is the past participle umgestiegen formed?
It comes from the separable verb umsteigen (to change trains). For separable verbs, the -ge- piece of the past participle goes right in the middle, between the prefix (um-) and the verb stem (-stiegen).
Why does this sentence use seid instead of habt to make the past tense?
In German, the helper verb sein (to be) is used instead of haben (to have) when the main verb describes travel, movement, or a change of state. Since umsteigen involves moving between vehicles, it requires sein.
Why does the end of the word change to -stiegen instead of staying -steigen?
steigen is an irregular verb. This means its vowel changes in the past tense. The -ei- in the infinitive flips to an -ie- in the past participle, making it -stiegen.
Who exactly is being addressed with ihr?
ihr is the informal plural form of you (like you guys or y'all). The speaker is asking two or more people where they changed trains. If they were asking one person formally, it would be Wo sind Sie umgestiegen?.