¿Por qué os peleáis tanto?

Questions & Answers about ¿Por qué os peleáis tanto?

Could I just say ¿Por qué peleáis tanto? without the os?
Yes, but adding the reciprocal pronoun os (from the verb pelearse) strongly emphasizes the mutual aspect: that you are fighting with each other. It makes the action feel more personal and reciprocal, rather than just a general statement about fighting.
Does os always mean "each other" when used with plural verbs?
Not always. It can also act as a reflexive pronoun meaning "yourselves" (for example, washing yourselves). However, context usually makes it clear. Since fighting is an action that involves opposing sides, os peleáis is naturally understood as a reciprocal action ("each other") rather than a reflexive one.
Why doesn't tanto have an -s at the end to match the plural subject?
In this sentence, tanto is an adverb meaning "so much." Adverbs modify verbs (describing how much you fight) and they never change their gender or number. Tanto would only change if it were an adjective describing a noun, such as tantas peleas (so many fights).
How would this sentence change if I were speaking formally to a group?
If you were addressing a group formally in Spain, you would use ustedes instead of vosotros. The verb would change to the third-person plural, and you would use se as the reciprocal pronoun: ¿Por qué se pelean tanto?

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