This is the 2nd most frequent Latvian word.
ka
The Latvian word "ka" means "that" in English.
In this sentence, 'ka' is used as a subordinating conjunction to introduce a complement clause expressing a fact.
Es zinu, ka tu esi gudrs.
I know that you are smart.
Here, 'ka' introduces a potential fact, showing its use in subordinate clauses for uncertain situations.
Varētu būt, ka rīt līs lietus.
It might be that it will rain tomorrow.
In this example, 'ka' links the main clause with the subordinate clause, reflecting the speaker's perception.