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Questions & Answers about Tú estás cansado.
Why is it estás and not eres in this sentence?
Why do both Tú and estás have accent marks?
Accent marks often help tell apart words that are spelled the same but mean different things. Tú means "you", while tu without the accent means "your". For estás, the accent puts the stress on the last syllable (es-TAS) and shows it is the verb "you are", unlike estas (without the accent), which means "these".
If I am talking to a woman, do I still use cansado?
No, you would change it to cansada. In Spanish, adjectives must match the gender of the person they are describing. Cansado is used when talking to a man, and cansada is used for a woman.