Il treno è pieno e sto in piedi.

From Lesson 137:Il corpo (the body)·Italian

Questions & Answers about Il treno è pieno e sto in piedi.

Why does the sentence use sto instead of sono for 'I am'?
While sono means 'I am', Italian uses the verb stare (here conjugated as sto) to describe certain physical postures and states. The standard set phrase for 'to be standing' is stare in piedi.
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.
Does pieno change its ending depending on what is full?
Yes. Since treno is a masculine singular noun, the adjective pieno (full) takes the masculine singular -o ending. If you were talking about a feminine noun like a car (macchina), you would say it is piena.

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