ka

The particle ka marks questions and whether/if questions in subordinate clauses.

When ka is at the end of a non-subordinate clause, it marks a question.

tu le lo ki na jan ka - "Are you going there?"

ka ja le tope - "Is it good?"

It can be placed either at the start or the end.

ka can also be used to mark whether/if subordinate clauses. It must be placed either at the start of the end of the subordinate clause, preferrably whichever would cause the least ambiguity.

mi le no wisan ta ka na le wen kanisa tope - "I don't know whether that is a good idea"

ta lan nin le se ka, le no sankan - "Whether or not a lot of people are there is not important"

In these examples, there is no ambiguity with whether ka applies to the whole sentence, or just to the subordinate clause. However, there are some situations in which it is ambiguous as to whether ka applies to the whole sentence, or just to the relative clause.

ja le wisan ta makan le loso ka - "Does he know that the food is bad?" OR "Does he know whether the food is bad?"

If a comma is added, "ta makan le loso, ka", then it's clear that ka applies to the whole sentence. In situations like these, it is generally recommended to add a comma before ka, but speakers often omit the comma in context anyways, and as such it is often up to said context as to what the ka applies to.