Questions & Answers about Ten obiad jest bardzo dobry, dziękuję.
Why does the word for "thank you" end in -uję?
The dictionary form of "to thank" is dziękować. This belongs to a special group of verbs ending in -ować. In the present tense, that -ow- part changes to -uj-. To say "I thank" (which translates to "thank you"), you add the "I" ending -ę, giving us dziękuję.
Why do we use ten instead of to for "this"?
The word obiad is a masculine noun. In Polish, words like "this" have to match the gender of the noun they point to. Ten is the masculine form. If you were pointing to a neuter noun like wino (wine), you would use to wino.
Why is it dobry and not dobrze?
I don't see the word for "I" here. How do we know who is thanking?
The ending of the verb gives it away! The -ę at the end of dziękuję specifically means "I am doing the thanking". In Polish, you usually drop the pronoun ja (I) unless you want to add special emphasis.