Learn Romanian: Acest om bea cafeaua repede. - This man drinks the coffee quickly.

Acest means "this" for masculine and neuter singular nouns. Since om (man) is masculine, we use acest. If it were a feminine noun, like femeie (woman), we would use această.

Why is the noun just om and not omul (the man)?

When a demonstrative word like acest (this) comes directly before the noun, the noun does not take a definite article ("the"). So we say acest om, never acest omul.

Why is "the coffee" written as cafeaua?

The base word for coffee is cafea. Usually, feminine words get an -a at the end to mean "the" (like fata for "the girl"). But because cafea ends in a stressed -a, it gets a special ending, -ua, making it cafeaua.

Does repede change depending on who is drinking?

No, repede means "quickly" or "fast" and it does not change its form here. Words that describe how an action is done (adverbs) stay the same regardless of the gender or number of the person doing the action.