Questions & Answers about К сожалению, я не могу прийти.
How does the phrase к сожалению work grammatically?
It literally translates to "to regret." It uses the preposition к (to/toward), which always requires the Dative case. Because of this, the neuter noun сожаление (regret) changes its ending to -ю.
Why does this sentence use the perfective verb прийти instead of the imperfective приходить?
You use the perfective прийти because this is about a single, specific event, like missing one specific party or meeting. If you wanted to say "I cannot come on Tuesdays" (a repeated action), you would use the imperfective приходить.
Why use прийти instead of a basic motion verb like идти?
The prefix при- adds the specific meaning of "arrival" to a verb of motion. While идти means "to go" or "to walk" in a general direction, прийти specifically means "to arrive" or "to come" to a destination.
I sometimes see the verb "to come" spelled as придти. Is that also correct?
No, the correct modern spelling is прийти. The spelling придти is outdated and considered a mistake today, although you might still spot it in older Russian books. Notice that the й drops out when you conjugate it in the future tense, like in я приду (I will come).