syna

In a sentence

• Vidím svého syna na hřišti.

  I see my son on the playground.

  In this sentence, "syna" is used in its accusative case to indicate that the son is the direct object of the verb "vidím" (I see).

• Ptala jsem se syna na jeho školní den.

  I asked my son about his school day.

  Here, "syna" is used in its genitive/dative case to indicate possession or to whom the action of 'asking' pertains.

• Hledali jsme ztraceného syna.

  We were looking for the lost son.

  "Syna" here takes the accusative form following the verb "hledat" (to look for), marking it as the object of the search.