Learn Polish: Nikt nigdy nie widział ducha, ale ludzie czują strach. - Nobody has ever seen a ghost, but people feel fear.

Unlike English, Polish uses multiple negatives. When you use negative words like nikt (nobody) or nigdy (never), you must still negate the verb itself with nie. A literal translation would be "Nobody never did not see."

Why is the verb widział in the masculine singular form when nikt could refer to anyone?

The pronoun nikt (nobody) is grammatically masculine singular by default. Whenever it is the subject of a past tense sentence, the verb must take the masculine singular ending, regardless of who might actually be in the group.

Why does the word for ghost take an ending (ducha) but the word for fear doesn't (strach)?

They are both direct objects, but the rules change because of negation. The first verb is negated (nie widział), which forces its object into the Genitive case (ducha). The second verb is positive (czują), so its object takes the Accusative case. Since strach is a masculine inanimate noun, its Accusative form looks exactly like its basic dictionary form.

The English translation says "has seen", but widział is the regular past tense. How do we express the Present Perfect in Polish?

Polish doesn't have a direct equivalent to the English Present Perfect ("has seen", "has done"). You simply use the standard past tense (widział) to talk about life experiences, relying on context words like nigdy to convey the meaning of "has ever" or "has never".