Ta lekcja polega na pisaniu zdań.

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Breakdown of Ta lekcja polega na pisaniu zdań.

• lekcja: the lesson
• zdanie: the sentence
• polegać na: to consist in

Questions & Answers about Ta lekcja polega na pisaniu zdań.

Why is ta used before lekcja, not ten?

Because lekcja is a feminine noun in the nominative singular, so the demonstrative pronoun must agree in gender and number. Feminine singular uses ta, not ten (which is masculine).

What does polegać na mean, and which case does it require?

Polegać na means “to consist in,” “to be based on,” or “to be about.” It always takes the preposition na, which in turn requires the locative case of the noun or gerund that follows.

Why is pisaniu in the locative case instead of using the infinitive pisać?

After polegać na, you need a noun in the locative. In Polish, the action “writing” can be turned into a noun pisanie (a gerund). Its locative form is pisaniu. You cannot put the infinitive pisać directly after polegać na.

Why is zdań in the genitive plural and not in the accusative?

When you have a nominalized verb like pisanie, any object it “takes” normally appears in the genitive (partitive genitive), not the accusative. Here zdanie (“sentence”) becomes zdań in the genitive plural.

Can I rephrase the sentence using an infinitive or another structure?