Questions & Answers about Il treno è pieno e sto in piedi.
Why does the sentence use sto instead of sono for 'I am'?
Why is piedi plural in the phrase in piedi?
Piedi is the plural of piede (foot). The phrase literally translates to 'in feet', which makes logical sense because you normally use both feet to stand up.
Is there a difference between in piedi and a piedi?
Yes! You use in piedi to describe the physical position of standing up. You use a piedi to talk about your method of transport, meaning 'on foot' or walking.