Breakdown of Спасибо за вашу доброту.
ваш
your [formal/plural] (ваш, ваша, ваше)
спасибо
thank you
доброта
kindness
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Questions & Answers about Спасибо за вашу доброту.
Why do we use the preposition за instead of для here?
When expressing gratitude in Russian, thanking someone for something is always expressed as спасибо за followed by the accusative case. The preposition для also translates to the English word for, but it is used to show who something is intended for, rather than the reason for your gratitude.
Why do the endings change to make вашу доброту?
The preposition за in this context forces the following words into the accusative case. Because the dictionary form доброта is a feminine noun ending in -а, it changes to end in -у. The matching pronoun ваша must agree with it, so it changes to вашу.
Does вашу indicate we are speaking to one person or multiple people?
It can be either! The pronoun вашу is the formal or plural form. You use this when thanking a group of people or a single person you address respectfully. If you were thanking a close friend, you would use the informal singular твою доброту instead.
How does the word доброту relate to other common Russian words?
Its dictionary form is the noun доброта, which comes from the adjective добрый meaning kind or good. You already know this root from everyday phrases like доброе утро and добрый день.