Breakdown of Мы почему-то поссорились.
мы
we
поссориться
to have an argument / to fall out
почему-то
for some reason
Questions & Answers about Мы почему-то поссорились.
How does adding -то change the meaning of почему in this sentence?
почему means "why". When you add the suffix -то, it creates an indefinite adverb meaning "for some reason". The speaker knows there was a reason they argued, but they either don't know what it is or can't explain it.
Could I say почему-нибудь instead of почему-то here?
No, because the argument already happened. You should use words ending in -то for real, specific things that actually occurred (usually in the past tense). Words ending in -нибудь are for hypothetical situations, questions, or the future, like "for any reason".
Why does the verb поссорились end in -сь?
The dictionary form of the verb is поссориться (to quarrel). The -ся at the end shows that it is a reciprocal verb, meaning the action is mutual: "we argued with each other". When conjugating in the past tense for "we" (мы), the verb ends in the vowel -и (поссорили-). After a vowel, the -ся particle always shortens to -сь.
Why use the perfective verb поссорились instead of the imperfective ссорились?
Using the perfective поссорились focuses on the result: an argument took place and now they have fallen out. If you used the imperfective ссорились, it would mean "we were arguing" (focusing on the process of fighting) or "we used to argue" (a repeated habit in the past).
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