Learn Hardcore Russian: Я ем пирог.

It translates to "I eat pie" (or "I am eating a pie" depending on context). The sentence consists of three main parts: the subject Я meaning "I", the verb ем which is the first-person singular form of есть (to eat), and the object пирог meaning "pie".

Why is there no article (such as "a" or "the") before пирог in this sentence?

Russian does not have articles like English. Instead of using "a" or "the", nouns like пирог appear without any articles, and context determines whether the idea is definite or indefinite.

How is the verb ем formed, and why is it used with Я?

The verb ем is the first-person singular present tense of есть, which means "to eat." It is used with Я because the subject is "I". This agreement between the subject and the verb is essential in Russian, just as it is in English.

What grammatical case is пирог in, and why does its form not change?