This is the 66th most frequent Czech word.
když
" když" means "when" or "if" in English.
Here, "když" sets the condition under which the main clause applies, functioning similarly to "when" in English.
Chodím tam jen tehdy, když mám čas.
I only go there when I have time.
In this example, "když" introduces a conditional aspect to the sentence, akin to "if" in English.
Když si myslíš, že to víš, zkus to říci nahlas.
If you think you know it, try to say it out loud.
In this sentence, "když" introduces a dependent clause that specifies the time context of the main action. It translates to "when" in English.